Should I get the Virgin Mobile Motorola Triumph or the EVO 3D from Sprint?

So I'm undecided on what phone and company to use. Its between a Motorola Triumph or an EVO 3D. I like the features of both but I just don't know. I like Virgin Mobile's plans because theyr'e really cheap and affordable but then I like Sprint because its not prepaid. I know that Sprint works really well in the area i live in. I just need some opinions from people. Thanks!