The 2.5-8's have a larger eyebox, easier to get on target quickly than the 2-7.
I have every generation of the 2-7x33's and 2.5-8's except for the current 3i. I like the 2-7, I wish I could like it more--it's less expensive and smaller and the glass itself is all a guy needs. Plus the LR dots are a more usable option than the ridiculous B&C flea turds cluttering up the crosshairs
My serious elk-getters have 2.5-8's, they are just easier and faster to use.
Casey
Casey pretty well said what I think. I too have owned every variation of the 2-7x33. I'm certain I've had at least 10 of them. I prefer the 2.5-8x36 for the reasons stated.
BUT, I really like the 2-7 too, and I can't fault 2muchgun's thinking. He's a guy that is out there doing it. All that to say we can all look at something differently, and not end with the same solution. It's not a right/wrong thing.
Quick question, does the 2-7 have the same twin erector springs as the 2-8?