I would say a civvie is better as they want to do it with you as opposed to being paid for it. They may not be the best looking or have the best technique but it can be far hornier.
while if u get a filthy sexually confident civvie who has a naughty side, obviously that beats a hooker, the chance of finding a civvie like that even if you can pull at will is probably one in ten. Too many civvies are inhibited in the bedroom for a number of reasons whereas if u want filthy depraved sex on tap you are more likely to with a hooker with a bit of research here.
I am comparing casual civvie sex with hooker sex rather than relationship sex which is totally different obviously.