Debating which length to go for SBR suppressed

Trying to decide what upper and barrel to go with. Pretty sure I want to stick with DI as im just switching my upper from 16 to the other and SBRing the lower, snagging a surefire suppressor. Current setup im looking at are:

12.5 with shovelnose or specwar.

11.5 with 9.25 MRP upper.

I know alot of people swear by the 11.5 but for some reason the 12.5 seems like the best in between length. I had a 10.3 a while ago and it always made me want more barrel length but with a 16 inch im wanting less and to run it suppressed.