In my opinion how you start or finish your threads in nobody's business but yours. I don't hold with making the back look super-duper tidy at all costs. So long as no carried thread is visible from the front, I do what is easier. I don't intend to show off the back of my work, so who cares how it looks?
I can however recommend the loop start if you're stitching with an even number of threads. It's a super easy way to start a thread because you don't have to make sure you're stitching over the end, and there's no wasted thread.