Like many folks here, I have owned and maybe still own a bunch - Sig, Glock, Hk, CZ, S&W, Colt, Browning, Kimber, Wilson, Walther, SA, Kahr, Ruger, Beretta, and others - but the winner is:
My Ed Brown Kobra. Everybody shoots dead nuts on with my Ed Brown. My old Gold Cup is damn close though I still prefer the Kobra.
A third runner up is my Israeli surplus BHP that looks like holy hell but is scary accurate even with its beat up sights. This thing is just point and click good.
I appreciate the nods to the P239 and the XD45, which are two dear to my heart faves. My XD45 is the longest residing handgun in my safe for a good reason.