Vega Asia DF is a good rubber, but I would prefer Vega Tour. Slightly harder sponge, but it doesn't feel harder, better performance in all departments.Can't speak about Donic.
JP-03 is a very soft rubber, it's topsheet is also soft. It's very controlled but also quite spinny if you brush properly. But on punches etc it's low spin. Speed wise I'd say a touch below fastarc G1. I personally wouldn't use it on my forehand since ABS but used it on my backhand to good effect