Both have a long history of sexual partners, emotional baggage, and likely diseases. But Amy is a all on slut (prominent character trait) but have less emotional issues; might legitimately cuckold you .
However, Lela is much more judgmental and would likely place you in the friendzone for 15yrs (while fucking assholes) until she decides to give you a small chance to woo her out of pity.
So Amy if you want an assured Friend with benefits.
Lela if you do not play as the nice-guy.