So I am about to order a new Banshee.  Trying to decide between the MkGs vs Mk17.  The MkGs accepts Glock mags while the Mk17 accepts Sig Sauer P320/Mk17/Mk18 mags.  The Glocks are polymer and the Sigs are steal however the Glocks offer higher capacity to 33 rds while the Sig only goes to 21 rds.  I actually like the look of the Sig mags better but and honestly torn between them.

Your opinions welcome on which one is better all things considered.

I chose MkG since I own Glocks. Glock mags are cheap, easy to maintain and relatively robust. I have no experience with the Sig magazines.

Glock mags

Easy to find, plentiful, aftermarket options...