I have a GR Leupold for work and field use and a Brunton Epoch (out of production) for more static general purpose. The Leupold has done everything I asked of it, take abuse and while not the best, very workable glass. The Brunton has amazing glass, brightness and clarity and just like a standard scope, you can definitely "see" the difference. The Brunton also adapts to my Nikon D90.
Mine are both straight models. In the field I prefer a straight version. There are some instances where the angle is better. Just depends on what you do more.