Board Game Arena

The thing about applying the yellow cube "upgrade" mechanic to science is that everyone would basically always be able to get the highest tier of buildings in every single game, taking away the score advantage of those who decide to focus on that aspect, basically levelling that score sour...

To answer the question of which I think is stronger:

By sheer number of pounds/kilograms in a straight lift I'd have to say the Elephant would win.
In a contest of weight lifted per weight of animal, however, I think the Rhino would win.