It's a toss up for me. There are some great Cherry profile PBT keycaps, but GMK keycaps are amazing. For reference I've tried a bunch of PBT sets (Cherry profile blanks, Pok3r, Vortex PBT, Granite DSA, etc) and lots of ABS (SA, DSA, Cherry, GMK, OEM, vintage cherry sphericals (similar to DSA but lower in height), Honeywell (similar to SA, but way thicker)).
My favorite PBT I've owned so far has been the Originative Hangul set I had on my Pok3r, but aside from that all my favorite sets are ABS: Nuclear Data, GMK Triumph Adler, Danger Zone, and ones I don't own yet (Calm Depths, Sky Dolch, Round 5/6 Space Cadet/Honeywell).