The malossi is cheaper because you need to buy a head with the dr, and easier for a first time because there is less risk of a base gasket air leak since you don't have to port near the margin. It's not a blaster by a long shot but it's a nice solid boost over stock and makes for a good chill daily rider.
The DR definitely runs harder than the malossi, it makes more power on the top end, and it likes the techno circuit for some reason I don't know, but will also do well with the proma.
Either way make sure you go for a roller bearing crank, and port the intake. You don't have to cut the crank but it helps, but you definitely have to port the intake.