Yes, there is no one right answer. The best answer is “What works best FOR YOU?”
9mm pistols can be lighter and more compact than a .45, which makes it more likely you will have it with you when TSHTF.
Just something about a 1911.
I agree. I have four in 9mm (Sigs and HK) and three 1911s (Colt, S&W, and Dan Wesson Valor)