Harden Vol 9 sizing

Planning on picking up my first pair of basketball shoes and I’m pretty set on the Harden Vol 9s. I wear a size 12 in most shoes (77 Blazers for example) however the Hardens in a size 12 are a bit snug, where as 13 is a little loose. Obviously this leaves 12.5 but I’m unable to try them on as they’re online only.

For those of you that have them, do they come a bit more loose after break-in? Idk if I should just get the 12s and wear them in or opt for a 12.5. I’m partially worried the 12.5s might become a bit loose after breaking them in.