Tong -
Focus on the type of ground you normally play on and works backwards. The type of grind for a 20-60 yard pitch shot is often different than for a full shot or flop shot.
You know right away the correct Edel grind. Greatest wedges for flop shots IMO because the trailing edge is shaved off so much. However, if you have soft ground you want a ton of trailing edge bounce so that the trailing edge hits first and doesn't dig. I've spent a lot of cash over the years on wedges and my favorite is still the Titleist 962-DCI grind (had that for over 20 years I think). Matches me overall for most conditions.
The ground, shot distance and attack style/angle all play significant role in a great wedge. Go with a forged wedge over cast (my 962 is cast, but I wish it was forged). Scratch golf makes some great custom stuff (and off the rack).
If I could, I would carry about 8-10 wedges. It can get that specific for perfection given all of the various course conditions and appropriate grinds.