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For all the reasons everyone here already knows the epic is a better phone than the HTC Evo. Regardless of preference the release of the Samsung Epic 4g has made the processor, gpu, and screen on the HTC Evo outdated.
Lets just drop it.
That's a mouth full. The epic is not better just based on specs. The epic is plagued with more problems and that's what the normal consumer will find out causing then to return it. The flimsy slider mechanism will not last on the epic. I would choose a vibrant, fascisnate, or captivate over the epic because of no movable parts

Sorry for the bickering, I just get annoyed with people who feel like they know everything.

Saw somewhere that an app will let you re-route the volume up/down keys to control the power. This solves the issue with opening the keyboard when power button is pressed.
I had both Epic and Evo and I absolutely do not use or need keyboards, However I kept the Epic. Main reason was Because of the Advanced GPU.
Regardless, the Epic connected to 4g is 5 secs while the Evo took 25-35+ secs. Whats the point of 4g if you have to wait that long to connect to it. For me and many others we are impatient for video streaming to start(heck I barely like to turn 4g on, let alone wait 35 secs extra). Another thing was the Epic's Screen was more vibrant, whereas the evo was washed out. The Epic was actually more versatile and realistic on day to day use even though the Epic is thicker. This is simply because it is lighter, contains more grip and had rounded edges. Myself and others thought of the Evo as a tablet and felt it was not as good for real day to day use because of its weight(felt like it would slip out of hands).
I can connect to GPS instantly on the Epic and I have gotten used to the power button(my screen doesnt slide open when i push it anymore, dont understand why other people cant figure out the right method to push it).
The Epic and Evo are both great phones, I do like the Evo's Kickstand and it seems more solid. I especially like sense UI. But I am a gamer and I want the best GPU/CPU so that way I dont get owned by Hardware fragmentation and not be able to run the latest apps.
A problem I do have with the Epic is that it makes squeeky noises when i push hard on the touch screen(i hate that), but it could just be my epic. Also, as I dont really use the keyboard, it does come in handy for gaming and typing in login/passwords (very annoying on VKB). But I would still like a slip on gel case to cover up the entire phone and lock down the keyboard.
I'd either say stay with Sprint and the Evo or switch to T-Mobile for the Vibrant. T-Mobile's rates aren't as good as Sprints but they're better than AT&T's and they usually have pretty good service most places.
I'm not sure how much I'll use the slide out keyboard but I'm still leaning towards the Epic for the speed and glass. I love to text with T9 so I'm hoping I can find a great T9 App on the market.
If the camera is important to you, remember the Vibrant doesn't have a flash.