I'll go on record and say that FGMM .308 168gr SMK (GM308M) is the standard by which all others are compared to by.
Or to quote Federal:
The Yardstick that all others are measured with! The FGMM 308 168 (and 175gr) is literally the "golden ruler" to which all others are measured.
I personally think Black Hills and Remington premium match ammo comes in a close second