Its UFC, PFL or GFL. I'd stay away from GFL, dont care what they promise you in terms of money its another One situation where they wont deliver and you'll be stuck there.
So its really PFL or UFC. PFL if they want him will offer him more and chance at mill in a tournament but he's not the most active fighter so 4 fights in 8 months is gonna be tough for him. if he managed to do it shit would only be one time and then he's a guy fighting on reg cards. PFL could def looking to build FW around him, they've pushed Loughnane who isnt the guy and Timur while very good isnt a big name so I could see them going with him.
UFC obviously has biggest fights but they wont pay him crazy money right away and he'd probably have to start at back of top 15 and work his way up. Plenty of fun fights but again its gonna be does he want to be in UFC and work his way up to title and legacy and all that or take whoever is offering more now cause who knows what happens in the future in this sport.