Both sites are good for advertising.  Most ladies I know use one or both of them.  You will find many of the same ladies on many different sites.  IMHO Eros is a classier site for advertising than BP is.  But I have advertised on both Eros and BP.  Results from each varied with Eros being quite a bit better.  

"most of the girls are not the same ones in the ad"  Wrong.  Some of them may not be.  It's the same thing everywhere you look.  You have to weed out the bait and switch ladies.  That's where the reviews here on TER come in handy.  Do your homework and you won't get burned.  

Peace, Betty