It is easier to find the exact spot with a straight scope...
For really long glassing sessions it is easier to find a comfortable position with the angled...
I prefer to put up with struggling to get comfortable and use straight scopes. Most disagree with that position. I have seen many times where I was able to get the scope on critters far faster than any one else and that is the trade-off I prefer.
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Had a Swarovski 65mm STM (straight) and traded here for a 65mm ATS and could not be happier with my Angled Swarovski.
The Swarovski does rotate so it super easy to get comfortable and stay low with it.