Notable attacks that both Yonko tanked (that really hurt or left them out cold) :
Kaido :
- Kong gatling
- Retainers tostuka togen
- Ashura
- TB
- Roc gatling /punches
Linlin :
- Shock wille 2x
- Punk Crush
- Punk Di Cordo
- 2-3 awakened attacks from Kidd and law this chapter
- Puncture Wille
Kaido tanked 3 ultimate moves (Yamato's, Zoro's and Retainers) but all 3 are below Law's ultimate moves which bM just tanked.
Don't forget both BM and Kaido were hit offscreen by SNs at rooftop
Also Kidd and law attacked BM offscreen in this battle (awakened moves included)
If you start counting other attacks which hurt them then Kaido tanked more hits on screen
But when it comes to meaningful/really powerful blows , BM has tanked more so far.