I have a difficult time finding sneakers that fit me. It seems like they are all too small or way too big. If find that the space above my big toe is usually too small to accommodate my toes comfortably. Some brands I am wear an 11 1/2 shoe. Some a 12 or 12.5. Some a 13. One thing I noticed is for some makers, the different between a 12 and 13 is ridiculous. it's like the difference between a row boat and a battleship.
I jog on a treadmill daily so having a good sneaker that fits is really important. I had a pair of size 12 2E New Balance sneakers last year and they damaged by big toenail.
Now I wear a size 12.5 2E New Balance sneaker, and I wear Sketchers relaxed fit size 12. I have Olukai slip on for summer, size 13.
I find the Sketchers relaxed fit to be the most comfortable. But it is always a project when it is time for me to buy shoes. Don't even get me started on golf shoes.