I haven't read interesting comparisons between B Side and A Side yet, so I write about it myself.
(Disclaimer: I only play 2p games without nature spirit cards, so that's what I am focused on.)
Luck factor: I think it's fair to say that B Side has a higher luck factor (by that I mean less influence of players to control who wins the game). Because the game is longer and more cards are drawn, it happens more often that lucky cards occur. Basically the game has more time to shift in not foreseeable ways. On A side, it's usually very good to concentrate on certain 3-4 cards, and really try to complete them, follow some plan that you layed out early. On B side, it's a little more important to keep your options open, play for cards that are not on the board yet, and overall play and adapt. On B Side, you will more often get points from a higher number of (more likely uncompleted) cards.
The role of water tiles: I feel that water tiles are even more overpowered on B Side than on A Side. This also adds to the higher luck factor. While on A side, the next water tile usually gives you a flat 3 or 4 points, on B Side it provides you either 0 points or 5 points, making it similar to yellow tiles. Who gets the next blue tile can be crucial at times.
Card values: It is clear that "base values" for certain cards are very different on B Side than A Side. Playing B Side makes you better understand why certain cards and combos are in the game in the first place. I'd say the most obvious buffed card is the parrot, but generally all these cards with 'triangle' water surrounding get some buff. Other cards got nerfed because of the way the board is shaped, less space in the vertical direction.
Placement strategy: As mentioned before, B Side incentivizes a little more open and adaptable play. Because the board is slightly larger, there is more space to do that anyway. Particularly sometimes it can be crucial to hope for a good water card and leave some open space around your water tiles.
Card tactics: This is more of a feeling. I feel it is more viable on the B Side to postpone to take a card and leave your card spots open. While on A side, I would usually take a card that guarantees me +4 points (of course it depends), it is more challenging to decide for that on B Side. Particularly early in the game, you want to keep your options open and rather not let your opponent get good cards while you are stuck with some moderate point cards.
Conclusion: I really like the variety that the B Side injects into the game. The board is both bigger and smaller at the same time, hence it produces new placement challenges. I don't really like the higher luck factor, the fact that card draws can screw or favor you more often. I'd prefer A Side if I were forced to choose, but overall both versions have their charm.
NOTE: For those of you who enjoy my tournaments, I am thinking to change to B Side more often, probably having every 3rd edition of the major tournaments on B Side (each month having one of Brave and Bold, Spiritless Spectacle, Champions League on B Side).
(Disclaimer: I only play 2p games without nature spirit cards, so that's what I am focused on.)
Luck factor: I think it's fair to say that B Side has a higher luck factor (by that I mean less influence of players to control who wins the game). Because the game is longer and more cards are drawn, it happens more often that lucky cards occur. Basically the game has more time to shift in not foreseeable ways. On A side, it's usually very good to concentrate on certain 3-4 cards, and really try to complete them, follow some plan that you layed out early. On B side, it's a little more important to keep your options open, play for cards that are not on the board yet, and overall play and adapt. On B Side, you will more often get points from a higher number of (more likely uncompleted) cards.
The role of water tiles: I feel that water tiles are even more overpowered on B Side than on A Side. This also adds to the higher luck factor. While on A side, the next water tile usually gives you a flat 3 or 4 points, on B Side it provides you either 0 points or 5 points, making it similar to yellow tiles. Who gets the next blue tile can be crucial at times.
Card values: It is clear that "base values" for certain cards are very different on B Side than A Side. Playing B Side makes you better understand why certain cards and combos are in the game in the first place. I'd say the most obvious buffed card is the parrot, but generally all these cards with 'triangle' water surrounding get some buff. Other cards got nerfed because of the way the board is shaped, less space in the vertical direction.
Placement strategy: As mentioned before, B Side incentivizes a little more open and adaptable play. Because the board is slightly larger, there is more space to do that anyway. Particularly sometimes it can be crucial to hope for a good water card and leave some open space around your water tiles.
Card tactics: This is more of a feeling. I feel it is more viable on the B Side to postpone to take a card and leave your card spots open. While on A side, I would usually take a card that guarantees me +4 points (of course it depends), it is more challenging to decide for that on B Side. Particularly early in the game, you want to keep your options open and rather not let your opponent get good cards while you are stuck with some moderate point cards.
Conclusion: I really like the variety that the B Side injects into the game. The board is both bigger and smaller at the same time, hence it produces new placement challenges. I don't really like the higher luck factor, the fact that card draws can screw or favor you more often. I'd prefer A Side if I were forced to choose, but overall both versions have their charm.
NOTE: For those of you who enjoy my tournaments, I am thinking to change to B Side more often, probably having every 3rd edition of the major tournaments on B Side (each month having one of Brave and Bold, Spiritless Spectacle, Champions League on B Side).