I prefer 748 for two reasons: meters well and runs cleaner.
Several years ago I went through a Chuck Taylor rifle course. I'd heard good things about 748 in the .223s, so I used it in building about 400 rounds for the class.
Part of the instruction involved cleaning the guns, which were a mix of .223s & .308s. In looking at the guts on several of the other shooters' ARs, mine were markedly cleaner than any of the others using whatever reloads & commercial stuff they were using.
Since I'm basically quite lazy by nature & hate to clean an AR, anything that runs smooth through my RCBS meter & reduces the cleanup efforts later goes high on my list.
Denis