Fair enough, but that's all subjective. IMO, I would favor soccer. It is simple but has very complex strategies and is much more fluid than baseball. Has possibly the lowest barrier to entry and is the most popular sport in the world - and for good reason.
Football is all designed and tailored for TV. Comparing it to baseball from a design standpoint is apples to oranges. Cricket on the other hand is not. Curious what your thoughts are on that. Apologies for the pushback, I've just never given much weight to a sport being "well designed".
In retrospect, you originally said game and then changed to sport. The most beautifully designed game is chess - thousands of years old, infinite possibilities, impossible to solve, pure skill.