I have a friend who did bodybuilding and later switched to long distance cycling (around 50-60 km per session), he tried both diets and said that eating meat is better for intensive sports, since it's more efficient for assimilation proteins, when he went vegan he needed to take supplements because his muscles got weaker and on longer sessions he needed much longer time to recover.

I instead eat everything without care, but I usually eat less meat and fish just because I don't like the taste that much.

I'm no expert in the slightest, but I think that if humans can digest both plants and meat then both are necessary to function properly, we just need to find a good balance.