What paintball gun should I get, Azodin Blitz or GOG Envy?

I've had a Spyder Sonix and a Tippman A5 both for about 3 years so i've had a decent amount of experience. I think its time i spend a good amount of money for a new gun. Asked my friends who have a G4, a dye NT, an Etec 3, a invert mini, a proto reflex, a Tippman A5, and an Azodin Blitz himself. I have a price range of $300.00 and my friends have came up with these two guns. An Azodin Blitz and a GOG Envy. The Azodin blitz does come with an Air Tank which I don't have.