Either version is fine. I cut my at 45 degree angles back in 2010, and others did it way before then. Some mix it up. Some do all rounded. It's a personal preference.
Edit: rereading your question I better understand what you're talking about, and I would say in the cases where it makes sense, you should cut the strips at such an angle. It depends on how you trim your parts to fit basically. I did that to the back of my thighs. It's a common spot to do so, as can be seen here: