Claremont is indeed a really fun, neat golf course. A great blend of quirk, charm, great bunkering, challenging greens. Does play longer than the yardage on the card, at least it feels like it. Similar in feel to Claremont is Sequoyah, which I also found to be an enjoyable, sporty test of golf. Like Claremont, it is short, with tough greens and some elevation change. It too is well worth seeking out if in the Oakland area.
Mira Vista is indeed a very good golf course. I didn't know anything about it until playing it earlier in the year, but was a great surprise it turned out to be. It has quality hole after quality hole, great views, and was in very good shape when I played it. It gets my vote for top course that I've played in the East Bay, but have not played some of the older clubs, such as Contra Costa, Orinda, or Richmond.
I would have a tough time comparing Stonebrae or Ruby Hill to Claremont. They are such different golf courses. Not that there is anything wrong with a modern, tournament style golf course, it just is pretty much impossible to compare them to one another.