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While wearing jeans: Bottom, there are stupid little metal things that stick out and will scratch the screen otherwise
Otherwise: Top, it's more convenient.
With my current model of phone, bottom left/top right specifically. There's a camera bar on it that makes it easier to pull out that way.
Top Right is how I use it, but I dont think its the "right way".
The screen has to be in, or else the case cant protect it if something impacts it (had a phone screen break on me once because it was facing out and I ran into a countertop). Top Left does make more sense, but somehow I got into a habit of twirling my phone so its top right.
So maybe top left is the "correct" answer to protect your phone from breakage, but I still have a habit of top right.
I usually do top left instead of top right just because I tend to touch my camera lenses if I hold my phone from the top side like that and I don't want to smudge them up.
Oh no, I'm top right. Please don't hurt me.