PA2Xpro may not have Mega voices, but it does have the well integrated Guitar Mode for the style section. But yes, the new Guitar NTT's in the T3 and the Mega voices are what DOES make the T3 stand out. I know as of now the SA is RH only, but I wouldn't be surprised to see that come soon to the styles. But the realism of strumming and picking parts, electric guitar and bass from the style section itself makes the styles of the T3 really 'pop'! For a translation to be as good (or better) than the original, it REALLY needs these, IMO...

As to integration.... Well, if the MS 'integrated' a great arranger with all that it currently has, it would be a world beating product, no doubt (as an arranger, that is). Currently, it only integrates the ENGINE for a great arranger. And leaves all the rest of the work to you. The vast majority of the arranger market (including those that DO buy arrangers like the T3 in this price range) want and need at least as good styles provided that they pay for in their 'closed' arrangers.

Integrate THOSE, and now you've really got something to get excited about.