Can't quite figure out what you are trying to say! You've said both cards 'can't' use instant replay, and this makes the RTX the winner. That just doesn't make sense.
So, reading a good, comprehensive review like this will help you:
https://www.tomshardware.com/reviews/amd-radeon-rx_5600_xt
Here are some of the takeaway points:
- Great 1080p ‘ultra’ performance, entry-level 1440p
- Beats out the RTX 2060 in most titles
- Uses less power than RTX 2060 too
With that said, this is with a vbios update for the 5600xt. So not all 5600xt will perform like that, unless the vbios is updated, and providing the manufacturer releases a new bios for the cards they sell.