I would say if you like the general amenities and environment of a spa, pound-for-pound you're getting better VALUE. VERY hard to find indies who are hot AND reasonably priced that provide all the services, availability and variety of a spa at the spa rate. Especially if you have 2 or 3 spas you frequent you're that each have a couple of girls you like - you're unlikely to be S.O.L. almost at any point. IFFF you like the spa "environment" ... and NOW a lot of AMPS are adding variety with Latinas. And it appears they take these review sites seriously. MMS have asked me to write a good review on many an occasion
Alternatively, you can make the argument indies are hotter, but in general they're A LOT flakier, WAY more expensive as they get hotter, harder to book, more work to connect with and the quality/mood can really vary SIGNIFICANTLY ... and some amps literally ANYTHING is on the table, and you have to search more for indies that have that many services
Of course, you'll always have certain girls that either are exceptional and exceptions - Tina Marie, Natasha, etc. - but those girls are the few not the majority
So to conclude my essay lol:
AMPS: consistency, best prices, usually great service, availability, easy access
Indies: Variety and "hotness"
AMPS win, but I'll still keep my harem of Indies