xttps://warcraft3.info/articles/266/experimenting-with-tilesets-in-warcraft-3
This is the link that agrees with what Im about to say.
In pro games only Lorderon Summer and Village Tilesets are used (majority)
Every other tileset is disregarded because of two reasons.
Aesthethics and unfamiliarity
Unbalance of Mercenary Camps.
If two maps have a different version. (Tileset one) Lorderon and Village is picked over.
Either Aestehteics need to be much better. Environmental graphics.
Especially for swamp maps and hellfire maps.
Or Balance the Merc Camps.
Rework abilities or change them up. Theres no point of them being the same if they arent being picked. The proof is already the limited map selection that pros make.