I think everyone nailed it. That's the issue... Everyone uses equipment a little different. What most people do the same is prioritize. If you take all the comments and add them up they are easy.
If you intend to use the spotter off a tripod and look at level or higher elevation that your vantage point go with the angled. With that you will need to practice on acquiring the target, which just like anything with a little time you will get very good.
If you intend to use the spotter looking down or possible from a window mount, or maybe for just analyzing an animal vs glassing. Maybe the straight is for you. I sure wish we could just have everything, but most of us can't. Best of luck
With that. I have used both and once I had the angled spotter figured out I was not going back. I spend a lot of time behind the glass, both binoculars and spotter on the tripod looking at all different levels. Most angle spotters rotate, and almost all tripod heads pivot making it easy to use while looking down (with practice of course).