I'm wondering from someone who has shot both suppressed. I have both guns, but my cans are in jail. Right now I have the enhanced setup as my main rifle, because I'm expecting the suppressor at some point. But then I got thinking...I feel like the SPR is a better balanced rifle, with the longer guard, and it's also 14.7 while the Enhanced is 16",  so I enjoy shooting it more.

My question is, is there really a noticeable difference shooting suppressed to have the adjustable gas block?

Had an M6-G (non-adjustable, but should have kept it), and have an IC-E and an A5... adjustable is the way to go, ESPECIALLY if you ever want to run supressed.

The longer handguard of the A5 is great; the only downside is the front sight cannot be mounted to the gas block (but most only run irons as backups, so this may be of no importance to you).