I'm with theohazzard, I'd never take the switchback down to a shorter configuration. I never feel the length or weight of the mask I have on the end of my guns, so why sacrifice performance for no tangible benefit to me. Now, if it outperforms the other 2 by a large margin, I wouldn't mind dealing with it.
That said, I've watched the disassembly videos for the switchback and rugged oculus, and there are a lot of screw together pieces. After having my mask for a couple years, I'm of the opinion that the fewer threaded portions the better. They get crudded up, get stuck, are hard to clean, I just tend to look at modularity in a 22 as more a bug than a feature. YMMV. In fact, the standoffs on the mask make a compelling argument for it over the oculus. I don't think you can really go wrond with any of them, but if I was buying today, I think i'd still go with the mask due to having zero complaints about performance, ease of maintenance, and honestly, I like the looks of it better than the ruggend and switchback. They're pretty busy.
I do highly recommned the gemtech QD mount for whatever can you get. I'm cheap, but I cannot recommend it enough. I finally sprung for it after I got my mask stuck on the 10/22 pretty early on and I have no regrets. It adds about an inch and an ounce or 2, but I don't feel it. But I switch 22 hosts a lot. You may not have that issue. (a suppressed 22 pistol is stupid fun. stupid stupid fun.......)