I'd buy the Delta.
If you want a good, just shoot them up type gun, with no asperations of collectability, I'd buy a Colt MT6731. The MT6731 is the Competition HBarII. It features a 16" Heavy Barrel and a flat top upper with removeable carry handle. They are fast, fun, accurate and very modular. Hard to beat, especially when you can get one for under $900.