I have the 11mm SG and i find it pretty good, mind you apart from that I only have bintel/GSO plossils so probably not much grounds for comparison. When i got the 11mm, which i exchanged for one of the ep's that came with my 10" dob, the guys at Bintel recommended the 16mm as well or in stead, but I was on a budget and couldnt front up the extra 30 bucks to get it. But i've found the 11mm to be a pretty nice ep to look through. I guess it comes down to getting what you pay for.
