I bought an angled one and hated it. Seemed very awkward to use. Replaced it with a straight one and wouldn’t dream of going back to an angled. Most of it’s time will be spent at the range with some western hunts thrown in.
I've borrowed a lot of both over the years and as I get closer to buying my own spotter I can't totally decide myself. Both have pros and cons, if I could own both I would.
I much prefer a straight. Every time I try to use a friend's angled, it reminds me how much easier a straight is to use, and it improves your flexibility! (Trying to get behind the straight)
Straight will give quicker target acquisition but angled is more comfortable to glass while sitting. If glassing down a steep slope the straight will be better. I much prefer an angled while hunting in steep ground up high.
Depends on your glassing style… binos on tripod and spotter for closer look? In that scenario I prefer straight. Picking apart a hill for hours? Angled. Glassing uphill? Definitely angled. Glassing downhill? Straight but angled works okay.
Some say they prefer the packability of a straight spotter but I’ve never had an issue packing an angled. For the hunting I do, if I could only pick one it would be angled.