I have used 231, Titegroup, Power Pistol, N310 and 7625.
The most accurate groups were N310. If I was loading for serious bullseye, this would be the powder. Tight group is good in some of my 45s, not others. 231 and 7625 worked well in all of them. Power Pistol is real good for full power jackets bullets.
Based on experience to date, if I could only have one of the powders, it would be IMR7625 first choice, 231 second.
I would like to try N320 as a universal powder, but the cost is scary. I use about 40 pounds a year.