Everyone will likely tell you the best is what they learned to use. I really do not like glassing with an angled scope, but I used a straight scope at work for 17 years. I think it's easier to locate an object in a straight scope. Straight scopes also lend themselves much better to using from a window mount.
As long as your scope body can be rotated, glassing from a window mount with an angled scope is easy and comfortable. Both styles have their advantages and disadvantages.
I use an angled. Outdoor life just did a video on this subject. I've used both, and for longterm glassing, hands down angled is more comfortable. Best suggestion is go to Cabelas and play with both for a while or borrow a buddy's and get some field time.
I'm a straight scope as well. Works better in the truck, which is good I guess. I just went with one and never looked back. Now after 15+ years of the straight scope I get annoyed trying to use angled. I think it's the nodding my head down to look and having more difficulty finding things that bothers me. Plus straight scope just fits nicely in my backpacks.