I'd go with the Humble Bundle people since they're doing a good job of spreading out from the constant weird mobile/indie bundle stuff to do more things like the Double Fine prototype stuff and THQ even had a bundle even if those things might've been from this year.
This is really comparing apples and oranges, isn't it? There's zero overlap on this Venn diagram when it comes to Play-Asia and sites like gog.com and the humblebundle/indieroyale/indiegalas of the world.
They're a great proxy service for Japanese imports and used game purchases. I'll email them with items I'm interested in and I'll get a response on price quotes. I've purchased a number of used items including, SNES, PS2, PS3, X360, and strategy guides. The condition of the games are always good.