I think it is personal preference. I have had both, and prefer the straight.
Ditto. When critters are on the move, I get the spotter on them quicker with a straight.
Same here, on both responses. Depends on your application and preference. FWIW, I'm retired from hunting, just shoot on the range. Straight works best for me.
Also, don't ignore eye relief. Doesn't get the attention it should.