If the goal is 1000+rwhp I would go twins all day. You can get there on pump gas and a 110% street car on relatively low boost (16-17psi).
Being able to adjust from 3-different boost settings (So the car isn't
always in "Race" mode) is a nice bonus
Splash in race gas and turn up the boost into the low 20's and make 1200+rwhp or pull it back to 10psi and roll around on "Only" 700rwhp.
Jeff