As far as I'm concerned there are only two brands to choose from. I have a Wilson setup, and there is Maximum Signal. As far as I know, neither will operate on the bandwidth used by most 4G service, but this is not an issue as if you can receive a 4G signal, you probably don't need a booster in that location.
Also, there are some new rules and FCC requirements that have hit recently involving cell booster mfgr's (and owners). I wouldn't be terribly concerned about this right now, but in the future a decision today could have an impact tomorrow. If you search stormtrack you will probably find the thread that discusses this matter somewhat and points to the FCC doc describing the new rules.