I don't even understand the point of a "Greatest Hits" album unless the artist has been around for at least 20+ years. If we wanted to buy your hits, we would just buy your regular CDs. I just think it is kind of pointless.
Either way, I would buy Christina because I far prefer her, but I already have all the songs I need, and all the songs on the compilation (except the new versions of Beautiful and Genie, which admittedly I do want)
Buying Hilary's & Enrique's. I was going to buy Christina's but I didn't like the "Beautiful" remix, nor "Dynamite" much. I'm also kinda over "Keeps Getting Better."