New vs old HR sensor

Currently using a fenix 6xpro for the last 5 years and starting to think it’s ran its course. HR sensor seems to be off on a lot of my runs and debating between getting the new instinct 3 Amoled or the new fenix 8. Any opinions aside from the obvious price difference? I know the new i3 has the same sensor as I’m running now and the fenix 8 has the updated version.