I have the straight on mine. No experience with the angled, but what the others say makes sense to me.
One other thought though- I have a pair of Pentax 15x60 binoculars. They are not expensive, and are pretty heavy, but they are MUCH more comfortable to glass with than a spotting scope. If I had money to burn I would look into a pair of the higher end high power binos. (Ziess, Zwarv's, etc.)
Much of it depends on how you will use the scope. For me, when I have hunted mule deer, I didn the vast majority of my glassing with binos, and then just used the scope when it was time to check out something interesting. I have a hard time looking through a single eye piece for extended periods. The high power binos overcome that.