The AGI is a true 22mm
device, so it would match the majority of mechs out there better than the Igo (assuming you like having matching diameters)
In my opinioin the AGI gives slightly muted flavor (still great though) compared to devices with a smaller chamber volume. It's a very small difference, but figured I'd mention it.
Also, if you are having trouble with leaking in dripper mode, there is an easy fix. Use two of those little silicone plugs that come inside the 510 connection on Boge cartos. Cut the "flange" part of the plug down small enough so you can jam the thing inside the holes in the AGI. This will seal it off by itself, but to keep the plugs in place I usually put the grub screws into their holes and screw them flush with the deck. After doing this I've had zero leaking from my AGI when in dripper mode.