Welcome to the forums, Wolf!
If those are your only two choices, I'd go with the EVO LTE, the S2 is pretty outdated.
If you can afford it, the Galaxy S3 would be far better as it's more current hardware/software.
The EVO LTE has LTE 4G while the E4GT is only WiMax which is more or less obsolete technology (Sprint has abandoned it in favor of LTE).