I would suggest SNS agmatine for numerous reasons. Aside from the capped convenience, I have heard some reports of users switching to Primaforce and not getting the same effects as with SNS agmatine; on the flip side, others have switched to Primaforce and have noticed the same benefits. Not sure if that's a batch issue.
Personally, I like 3 caps SNS agmatine with my preworkout high carb meal, 45 min preworkout, or first thing in the morning.