So Rival Wings is out and like previous pvp modes you get a mount for 100 wins.

It's a large-scale mode so your individual contribution isn't much; maybe even less so than previous modes because there can only be one machina per party so other people can deny you of using them.

If you happen to be on the losing side it's demotivating because your individual contribution to the match essentially amounts to nothing if your team does not win. Progress towards the reward is largely out of your hands.

That's why I feel like individual contribution should be rewarded more than team wins. It motivates you to try your hardest throughout entire matches even if your team is losing badly....

They could track lots of things like KOs against players, picking up CE tanks, capturing the generator, destroying towers, KOs against machina, etc.
Track a bunch of different contribution methods by individual achievements, then reward the mount for an aggregate achievement that makes you do all of them.

That way people learn of all the different aspects of the game and can control their own progress to rewards even if unluckily placed on the weaker team a lot.
TL;DR: reward individual contribution more. at least with a minion or something.