Does anyone ever notice that the T4 blade is kind of shape of a dragon's head? The thumb "groove?" is the eye and the risen swedge is the nose. If the blade was serrated then the serrations would be teeth.
Back on topics...
For the money I would say T4. I don't have a T4... I missed the pre-order and now they're sold out... I'm going off my experience from the Reloader and SS flipper that I've owned in the past. Brous puts out good knives for the price. His flippers are excellent, but I would have to say 0777's flipper is near perfect if not already. I've never had a knife that would just so effortlessly glide back into close position yet the detent is still strong enough to product a perfect deployment. It's quite amazing that a production knife can be that good. The Reloader is a strong flipper as well, but it's definitely not as smooth as the 0777 and I'm sure it'll be the same with the T4. M390 is an excellent steel and one of my favorites, but unless you go on a knife cutting marathon, I don't think it'll really matter since both steels have good HT. I guess just go with which ever one you like after you handle them both. I can say is that 0777 will feel amazing since it's so light. It's like magic. I'm sure T4 will feel similar to the Reloader, heavy and well built.