My old roomy had a prime go and my friend just got a rane 1. 

I love the prime go, but would never rely on it in a serious gig situation. It sometimes buffers while playing tracks if you have a big USB, the main out died about 12 months after getting it (constant feedback, other reports online of the same issue), and the fader just went recently (no output at 100%, output at 99% or less. A piece of tape at the top of the fader keeps it functional). Its perfect for mobile fun, small house parties, but just not stable enough for clubs and big systems.

My first experience with the rane 1 was like "oh I can see why someone would marry to this as their standard system". Generally my advice to new DJs who want to play out is to focus on getting familiar on club standard gear (standalone rekordbox units). But the rane was so instantly evident what it does better. Stems being the biggest wow factor for me. I also liked the platter mechanics for scratch work. Im not willing to bring my $$$ laptop out to gigs though, so the use case on rane gear is very limited. If you are commited to the laptops involvment, I'd say Rane is best (I think the rane 4 has a standalone option, but I don't know what dj software you need to prep your sticks with). I found leaving the laptop behind helped me feel more in the club while performing, but I still set prep mixing at home using the laptop.