The only major difference I've noticed is between arched and flat mainspring housings. It would take me a couple hundred rounds of practice to switch back and forth between those (when I practiced several hundred rounds a week, with emphasis on quick target acquisition.)
I wouldn't call it a "checklist" of features. I would figure out what you want to use the pistol for, what features would be useful, then which pistols match your requirements. For example, I knew I wanted a 1911 for range work and for carry. I settled on a bobtail commander as the best option for me. It had night sights, which I think are somewhat useful, but not mandatory. I didn't get one with a ambi-safety, because I didn't evaluate working the safety at speed, with my weak hand as a priority.
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