Maybe this doesn't apply to your foot, but for me, I have a slightly low volume foot (flat, a tad narrow and kind of boney). Finding boots can be tricky for me and although I'd like to check out every brand and pick which one I like, I am limited to what boots fit my feet. I wear a 9.5 in almost everything. My kenetrek UI mountain extremes are a size 9 narrow and they feel like the most perfect fit and very comfortable, but they give me blisters on both heels. I have a pair of Lowa Baffin Pros that I recently ordered, heel is perfect very comfortable breathable boot, but I can tell they are a little wide in the ball of my foot. Since I'm still in the break in period, I hope they form to my foot a little better with time. I have a pair of Danner Canadians, I ordered a size 10 because I wanted it to be a cold weather trekking boot. Fit is ok but with heavy socks and superfeet the toe box feels too small.
Next pair I'm going to try is La Sportiva Pamirs.
My point is - if you're lucky most boots will fit you very well and you'll have pick of the litter. But much like everyone has said, find a boot that fits you.
I used to be really into which brands had the better reputation, but not matter what the reputation is of a particular boot, if it doesnt fit it just wont work for you. Try on as many pairs as you can...
Luke said it well..."your feel will tell you which one is better"