GBBR open bolt vs closed bolt

I'm thinking of going to a GBBR. What's the difference and pros vs cons of open bolt and closed bolt systems? Is one significantly better than the other?

The G&P, King Arms, KWA M-4 are open bolt, but the WE's still have some Closed Bolt M-4, WE G36, M14, AK 47 are open Bolts, GHK M-4 and Ak' 47s are open bolt.

The G&P, King arms, Western arms, Bomber, Viper, and few other uses all WA based Magazines the G&P Pmags works greats
The VFC HK416 use its VFC mags or G&P Pmags made only for VFC
KWA LM4 uses KWA Pmags and KWA standard {but standard mags work best}
WE has open bolt mags and closed bolt mags that are for WE M4 only, Be prepare to work on mags.

they all have some type of bugs that needs to be work out depending what day of the week they were put together
I like the G&P WOCs due to easy to work on and G&P Pmags are easy to work on,
Before you buy should check out Sobecho King Arms , Allout G&P, and Turbotom's KWA, and if I was there I would have the VFC, and if you let Allout know he can bring one of each of WE open and closed bolt for you to look over.

NS2 - is that open bolt or a third type altogether?

NS2 is a KWA system . pretty much it is on the blowback pistols and SMGs. It;s a combo of the mag design and lighter internals . For the rifles they call it FV

I know ALLOUT has an package deal on His WE's , if you PM him he can tell you what he has