OK, I've tried last year's Vita for a friend, and I can't remember which "type" it was, but I'm going to go off the Specialized website specs and see if I can't help you out.
Looks like the frames have the same geometry. If you liked your body position on the Vita, then you'll also like it on the Vita Comp.
I don't know what the difference is between the two types of aluminums on the bikes, I'm going to guess that the V.Comp is lighter and maybe stiffer. Stiff may sound bad but, on a bike, it's actually more efficient, so stiffer is *usually* better so long as it's comfortable.
Shifting: Vita uses Shimano Altus, V.Comp does Shimano Tiagra/105. You will likely find the shifting from one gear to another on the Comp smoother feeling and with less clunking noises.
Gearing: While both have triples (slightly different chainring sizes, but not that off), Vita is an 8-speed 11-32 (almost a mountain bike cassette?), V.Comp is a 9-speed 12-25. Technically, this makes the Vita have an "easier" easiest gear than the V.Comp, which might make it easier to go up hills except when you consider how much heaver the Vita will be than the Comp. These factors might cancel each other out, not sure. Not sure what your feelings on hills are like, but this is something to keep in mind. Yes, you can swap out the cassette on the Comp if you want to, but you'll likely *also* have to change the rear derailler at the same time to account for the distance.
Fork: Vita has aluminum, V.Comp has carbon/aluminum with Zerts. Theoretically, this combo on the Comp will be lighter and help absorb more rattle from the road.
Wheels: I'm not familiar with the Vita ones, the Alex rims, but the Comp's Mavics are pretty good. For tires: Vita has 700x32c wire bead, all-condition sport, V.Comp has 700x28c, kevlar bead, armadillos. The Comp tire is a little skinnier, lighter, and resists punctures (mine went almost 4000mi without a single flat). That being said, tires are easy to change out on any bike. Since tires and wheels have a lot of rotational momentum, the weight factor is huge here; not so much in how light the overall bike is, but in how much effort it takes to put and keep them in motion. A good stiff light wheel will feel like it's almost pulling you forward a bit.
Most of the other stuff is not that different or won't make much of a difference to your riding at this point.
Were it up to me and those were my two choices, I'd spring for the Vita Comp...but keep in mind that cycling is something I *really really really* love and plop a full wallet into the hobby as often as possible to make it as enjoyable as I can. I like to be comfortable and have reliable stuff and don't skimp. Others certainly feel different about it, so do with this information what you will. Another option is to go cheap for now, and if you end up really enjoying cycling longer distances and faster, then it's time to upgrade for a road bike like the Dolce or Ruby.
-- gnat! {Too many options.}





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