I could be wrong but as I understand it, both S-23 and Mangrove Jack's California Lager yeasts are probably better suited to the California Common / "steam beer" style than to a bock. W-34/70 is a good old reliable lager yeast that has made great beer for me and for many others.
Dave, I'm not saying you're wrong, but why would those be better suited to steam beer?
I dunno... what does the term "California Lager" mean to you?
I've never used S-23 so maybe that's just another crap yeast that should not be sold, that's what I've gathered.