I have had both and currently have a TM1 and a KX6. The KX6 is a softer shooter out of the box
Than the TM's with gracoils. TM's feel a bit more lively and whippy. Both are great trap singles. I happen to shoot the K gun better at the moment. Feels more solid and the stock design is superb (in function!)
Take it from a P gun shooter. No comparison.... That being said the P gun seems to work for me. Now this weekend or next I plan on shooting a friends K 80 for a test spin. I have shot it before a few years back with the O/U barrels and I seemed to shoot it OK. I'll be shooting it with the unsingle barrel next. I'll let you know how it goes. I will say that the two guns seems to swing and behave quite differently to me. I started with a 101 that seemed to fit me well, then an XT (which IMHO swung a 2X8) until I bought my SBT Perazzi TM1. I believe, and again this is just my opinion, that some people shoot either a P gun OR K gun well. One of the guys I shoot with had sent his Kregoff back for work and was shooting his Perazzi while the K gun was gone. He was having issues hitting with the K gun when he got it back as he was used to the Perazzi. One of those things you need to "try before you buy" I think.