My favorite to shoot would depend upon my mood at the time.
Out of what I have now it would be between my 3" S&W 65LS (shooting magnums), S&W 1911PD, and CZ 75B.
Out of everything I've ever had it would be between a full sized all steel Charles Daly 1911, .40S&W SIG P229, CZ 75B and S&W 57.
If I must pick just one as most fun to shoot it would be impossible. One auto and one revolver, a steel framed 1911 and the S&W 57. I will probably be trading my S&W 1911PD (now that I don't carry 1911s anymore) for a full sized steel framed 1911 (probably Springfield Armory, though I may go with Rock Island Armory to save money) and I wouldn't be surprised if I buy another .41mag eventually.