How has the nightly been for you in terms of stability? Been thinking of switching to it from beta. The memory issues on MacOS are killing me, and I believe there are fixes in nightly now.
IME, desktop nightly hasn't ever outright crashed (less lucky with mobile nightly). Sometimes I notice minor rendering glitches on various sites, but I also have Servo's CSS engine enabled which might be doing it (it's not yet the default).
Well, it used to crash a lot at some point : when e10s was first activated by default in Nightly (in 2013 IIRC) it crashed several times a day. I stopped using nightly for a year afterwards.