I'm also on the fence with Nirvana, I don't think their stuff is mindblowing, some of the most trickiest germers in fact.
I like Greenhouse, I visited their shop and thought they were all really cool down to earth guys. All the bad rep I've heard is about their strains starting to not be as stable and start herming. At the same time, we all know some herming can be a result of stress. Maybe GHS should try answering these complaints directly and that might get their rep back up.
Neville's Haze, White Rhino, Trainwreck are some of my favorite strains from GHS though.