I agree that Delta has many many more choices, but the problem is I don't actually like ANY of the delta choices of trim. Especially the tub spouts. If I get the Delta universal valve, can I put spouts different tub spouts /showerheads on their? I don't mind the levers, they are ok.
I called our plumbing supply store in NYC and they said they have Kohler parts and its not a problem. But yes True that there isn't a "universal" Kohler valve and I will be much more limited with choices of trim depending on which valve I choose.
The one I really love is the Grohe GR-PB101 Atrio Pressure Balanced Shower Trim with Multi Function Shower Head, Tub Spout, Shower Arm and Single Lever Handle
I just wish Delta had something that was even close to similar