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Both SCT and XCAL are very much the same thing, however VMP tuning will pretune your SCT for you, so go there and get one. Both 2 and 3 are the exact same thing except 3 has one thing different with it for newer vehicles, so 2 will be more than adequate for you.
I love my diablosport, but since i havent used the sct tuner i guess you could call me biased. But yeah, the xcal 3 is a tad bit newer. Listen to jthorn, he knows.
the diablo sport is better for self tuning but justin at vmp knows what he is doing and i honestly doubt u will get a better tune unless u get a dyno tune