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I can't stand angled spotters. They have their place but not for me
Most glassing for me it is just awkward. In the right situation it crates less neck kinking but I don't usually stare through my spotter for hours at a time, generally it's lots of glassing with binos, then zoom in with the spotter or sometimes pick a hillside apart with a spotter but then I move on. It's tough to find stuff sometimes with an angled eye piece and really awkward to me when glassing out a truck window.
Its good to be straight! Mainly for being up high and glassing downhill. Mine is angled because that was the one I was able to get for almost half off. I am used to it and though I spend countless hours behind it every year, I'm not about to buy a new one unless I could sell my current one and get into the new one on the cheap. BTW, you're debating straight vs angled eyepiece, not lens.