Angled is more comfortable in my opinion and easier to get behind it in good position. Also like angled better for phoneskoping, screen is easier to watch
Depends... sometimes on these little spotters that can't rotate if you want them to, the terrain type... the vegetation can hamper where you can glass at.
For example... if you're in chaparral or similar type environment where the vegetation can be tall all around ya sometimes, and you need to be able to look over it with an optic.... an angled that doesn't have one of those repositioning rings that lets you rotate them to change the angle into the eyepiece... then you just can't make use of that particular optic in that particular situation.
I agree that when possible.. and if the spotter is going to be your ONLY scanning option you'll be using... to grid with... then yeah, it can be a little easier to get comfy when settled into an angled as long as the vegetation type isn't messing that up for ya.
Like looking uphill in more of like a Western Desert Hills type of situation, where it's more Arid and thus not a lot of tall brush, they can be fine. But I tend to use my binos first, to hit all the high value spots in the FOV, then, a once-over of the ridge over there. And then... possibly over to spotter to make sure that within all that ridge, I'm made SURE to look within the bushes/brush to make sure clear or not. So I don't want to have to do a bunch of repositioning if I first see something in Binos, then wanna grab for spotter to get "closer". I'm already pointed the right way.
So swapping back and forth between two straight-bodied optic systems, is overall a touch easier. most of the time. That rotating body that some angled have, to some degree, overcomes that issue though, since you could just mount it up... it's already pointing at right direction.. then you just rotate it to get access to eyepiece. But these little spotters don't usually have that option built in to rotate the spotter's body like that, relative to it's mount. So overall... so far, for where I've been hunting in... the straight-body optic just works more rapidly. And is easier to pack. But whatever's clever, right?