Strictly a " I want my wedges to match" thing....
I have 58 and 64 degree Callaway pm grind wedges. My Ping I-e U wedge is 50 degrees, which ends the irons.
I need a 54 degree wedge....the Martha Stewart in me says get a pm grind 56 to match the other pm grinds and bend it to 54. The practicality in me says just get a md3 54 degree.
I will hit a lot of full shots and chips although the ping would be my main club for chipping, like my old pitching wedge was. 58 would be my sw for the most part....so..... I dunno.