All 3 make good cues. Schon are probably a cut above the rest, but you will pay for it as well, at least with any normal sort of design and inlays. Schon though comes with a more standard maple shaft, where the others typically come with their brand of low deflection shafts, and both Mezz and OB make great LD shafts.
My solution, and one that a lot of players use - get the Schon cue and pay a little extra for the LD shaft of your choice, then you get the both of best worlds!
Scott