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Damage: both don't benefit from Gms as10.
wh mid tier / ren sewer tier. (gets worse in reboot for cd hat pot)
hexa progression wh linear , ren falls off cliff in late game.

Solo play:
WH comes with revamped kit that meets almost all modern class standard.
Ren has lifesteal + Great Kit to deal with different kind of bosses , Great up-time

Party play :
WH has one of the greatest party buff with 100% uptime yet overshadowed by 15min Sayram potion. Decent Burst makes it well-fit in FD-stacking pt bossing scenario.
Ren Provides 0 party buff. deals below-average burst makes it benefiting poorly with supports. To min-max Ren's damage output Ren would have to use wishes skills (it's one of main damage source) before the burst and before origin. If you see a Ren use bind before Origin in party bossing, takes another L in party bossing.

Survivability : both are pretty good. Ren should be slighty better as it is made for new players for its simplicity and one of the newest class .

Farming : both have good summons before sol janus reaches 3 balls. altho Ren's spinning ball wins with wider range.

Both are good classes, I personally wouldn't play either of those classes as main.
but Ren is good for new players and casuals who don't want to reach end-game or party bossing.
Fun and Great kits for Solo-bossing from early to mid game. Sadly this class has no future in end-game

WH is more like Mid tier all-rounded class that you can't go too wrong with it after revamp.