I love my 9mm CZs, but think the 97 is terrible compared to its competitors. It's just massive and clumsy, yet has a smaller capacity than other double-stack .45s like the Glock 21. It's also rather expensive.
I think the PPQ 45 is my favorite of the double-stack striker .45's, followed by the Springfield XD 45, the M&P 45, then Glock 21.
Hammer-fired, I prefer the FNX-45 slightly to the Sig 227; it's really a toss-up. The Sig felt better in my hands, but the FNX shot better at the range. I have not shot the HK45.