Air assualt is the sleek department when compared to the ground assault department, so Six Gun is better than Cog on that alone. Furthermore, despite Cog's alt. mode not having kibble Six Gun has the better alt. mode despite the kibble on the underside. That's because the kibble functions as a display stand instead of being unsightly.

It'll be awesome to see both Cog and Six Gun combined with the leader class figures.