Here is my take,, if you are going to be looking up hill most of the time get the angled,, ya i know you can roll the angled to look straight or down hill, for me the straight does it all , i have a Kowa 884 its big and heavy but to me the best one out there, i don't pack it anywhere ,its just to big , but on a window mount the straight is fast and simple,, on a good tripod down into the deep canyons or high on the ridges it just flat works , just my 2 cents