I have both angled and straight. When I backpack with a scope, the angled goes. When I am glassing from or near the truck, the straight scope goes.
When backpacking I take a light tripod that is more stable low, and I am usually glassing up or straight across. I weight the tripod with a stuff sack full of whatever is handy, but it is still not as stable as my big aluminum beast tripod that stays in the truck. At least not with an 80mm scope on it. So, I prefer to set it up as low as possible for comfort. Typically me sitting on the ground or sitting in a short chair. The last part of this is that I sometimes don't put my scope on the tripod. I just lay it over my pack or make a nest with a jacket. Not possible with a straight scope. This is also why my angled scope is a Leica with top focus knobs.
From the truck, I don't care about weight and use a heavy Bogen tripod with an equally heavy gimbal head. Even at full height for me standing that is a solid tripod. My lighter and physically smaller CF Surui or Slik tripods are never going to be as stable. The straight scope is also easier to use on a window mount.
If I could only have one, angled would be it. It will do all of what a straight scope will, perhaps not as quickly, but it also does a couple of things the straight scope can't do.
I'll say, that when I glass, the scope is a check that animal I saw with my binocs thing. In 4 hours of glassing, 3.5 are spent behind binocs, and .5 is behind the scope. Its more like, hey, there are some tiny elk way over there, get the spotter on them to see if they are worth my boot leather.
Jeremy