Spotting scope, angled eye piece v.s. straight

Well, for field use I think straight is better.
Your head can be lower than with an angled eyepiece with the scope the same height off the ground.
If your using it with a car window mount I think straight is easier.
For the range I think whatever you like is best. But I like angled myself. But I'm not a "hater" either.

You lose the natural pointing ability with an angled lens but but you limit your viewing positions with a straight one.
There are pros and cons with both and having both I have come to prefer the straight design in a compact size.
From a bench or car seat or while sitting with a short tripod you can appreciate the angled design for its comfort in maintaining a long term position.
I have come to favor a good sturdy yet lite tripod and an old Compact Leupold scope especially if scouting or going as a non hunter, I just keep the legs deployed and can set up in seconds to see/judge an animal, in these cases I usually carry a pair of 10x42 binos.
When I'm actively hunting myself I rarely carry a scope unless I'm posted up and can take advantage of the "view", otherwise I just carry binos either the 10x42 or 10x50.

Depends

I use both. I mostly use the straight through view at the range and for quick views of anything but, if I need to do serious long glassing secessions, the angled view is much nicer. My scope with the angled optic is a 90 mm objective while the straight view is a 60 mm. It is easier to locate target with the straight view but after some practice it's not that big a deal. The straight through view is quickly uncomfortable used from prone but is great off a bench while seated. Either works off a tripod while seated. If I was forced to only have one or the other, I'd go with angled.