Durabitlity and reliability, which handgun is the best?
I have to laugh at the people suggesting a 1911. They are finicky guns that require hand fitting the parts. They require quite a bit of maintenance as well. Time has passed the model by. They are still great guns but in the context of this thread I don't know why anyone is suggesting one.
The real answer is; there is no best. Buy and use what works for you. Personally I'd buy a Beretta 92 variant and follow the maintenance instructions. Or buy a Glock along w/ a bunch of spare parts. The thing about them is that there isn't a lot of parts in them to fail. The parts are cheap enough to have replacements on hand. Kind of like an AR15.
I could tell you what my favorite pistols are. But, I never attempt to take the triggers apart because they are a puzzle and then some. One would eventually break and I'd have to fix it. I can change out the trigger on a Glock quite easily. Ease of working on should be high on the list.