Apples to Oranges. Completely different game genres.
As far as i know War3 was not a very popular esports game as it had multiple balance issues. A better comparison would be starcraft 2 vs LoL/Dota 2.
In that case both games, at the highest level, have their complexities. Mobas require team synergy and cohesion whereas normal RTS games rely more on 1v1 for serious competition. One is more a team game the other a solo game.
Really hard to compare.







