Conti 4 Season is a great tire, ride quality just a notch lower than GP 4000s. I've run 25 mm GP 4000s for years, very rarely ever get a flat (I do some gravel road sections on them, too) until the rear tire tread is near the limit, then flats tell me it's time to change, much like any tire. One of my buddies runs 28mm GP 4000s on 25mm wide rims, tires measures a shade over 30mm wide!
As for the Vit Evo, it is an event tire. Very soft rubber gives great traction but also cuts easily. One buddy races on them. Another tried as a regular tire, love the ride and handling, but could only get 800 miles out of the rear (yes, he ran proper pressure for his size). After going through 5 Vit Evos he came over the Conti GP 4000, too. He said Conti has just a bit less feel, but is just as fast and longer lasting.
I've gained a bunch of weight the past year but I can still get 1500 miles out of a GP 4000 rear! Important to me is the Conti's great wet pavement traction. Confidence inspiring on wet mountain roads.
Cheers,
Bill in Roswell, GA