I dont have any experience with the others but I have loved every omnimount I have used (UCL, 75/100-CL, stainless speaker mounts.) The UCL is very strong and folds real close to the wall. As far as instalation they dont get much easyer. One other nice thing about the omnimount is that all the joints have hex nuts on the ends so you can tighten all the joints so it is firm moving, not as loose as some units I've seen.
Only thing I dont like on the Omnimount is that there is no kind of cable routing or organizer on the mount. I just use one of those flex cable covers with the slit along the side and I dont have any problems.
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