Do you find those faster in low light?
So, for me, it’s easier stacking two dots in low light than lining up three horizontally. It’s not a big difference at all to be sure, more personal preference than a matter of speed.
Sights are a pretty individual thing. I can be perfectly happy with many of them. HD/XRs are great, Agents are great, Novak’s, Heinie, etc, etc, etc. My personal preference just tends towards I-Dots with the narrow front. I put them on all my Glocks except the 19 MOS which has Ameriglo Troopers, very similar to your Agents. They don’t make I-Dots for the MOS series...or at least they didn’t. Maybe they do now, haven’t checked.
Regarding your Agents, Ameriglo sells front sights individually in various heights and widths. If you want to try a narrower front, give them a call and they’ll sort you out. I’ve found them to have good customer service.