I like the 200 gr bullet in my GAP Glocks. Right now I am carrying the Corbon 200gr JHP. It's as close the old school flying ashtray as you can get. I also have the 200gr SGDHP, 230 WWB JHP, 230 HST (In my night stand XD Tactical LE), Powerball, DPX.....
I seem to be a GAP ammo "collector." I pick it up when I see it. Been carrying corbon lately because they give a great discount to military/LEO discount and free shipping if you order from them direct. I try to support the businesses that support us.
On a side note, shot placement is the most important factor. You can drive yourself nuts (I have anyway) trying to figure out what the best SD round it. Pick one and go with it.
Learning from my mistakes since 1974