If you don’t know any of them you should go for the blackest Trail Loop. When I got my first Ultra I went with the blue Trail loop because it was the only one available, and I bought the green Alpine Loop. I ended wearing mostly the Alpine because of its color but the Trail was much more confortable. With the Ultra 2 I got the blackest Trail and it is perfect. I don’t find the Ocean confortable at all and plastic lugs can be a little wiggly depending of your band (I sent back my Midnight blue to Apple).
My trail loop looks exactly like yours, stitches about 10-15mm on the right from the axis of my wrist. You should go for the L alpine loop, I can wear mine at the fifth loop so it’s not too much under my wrist and it doesn’t annoy me on my laptop.