IOS keychain

I never used this feature in an iphone before but glad I am using it now!

Skipped out on not knowing how useful apple keychain can be ever since it was a feature, which going by what I google was all the way back in ios 13. I've just been using authy for my two factor (since I can't think up a strong code). Now i'm on ios 15 and WOW I can't believe what I missed out on! Apple keychain generates strong creds, autofills, and most importantly stores them all in icloud for you!

Although, having a dilemma. Would you say you personally would want/need your bank info stored? Or would I be better of be keeping my creds in a physical notebook I keep secure?