Stats could be really important if you want to get better in Apex Legends. There is a big difference in many stats-trackers between legends. Some of them are quite better than other once and you can use it based on statistics.
There is no other place at the moment than play-apex where you can check legends winrates. Check legends rating by any stats-tracker that exist in game.
Characters stats depends on their skills in game aswell as used weapons. Some quick heroes loves to use shotguns but some slow and durable used sniper riffles and machine guns.
We are currently hardly working on new stats about Apex Legends to give an advantage to our users by analysing legends, weapons and stats trackers.