Unlike the basic Dragoon, this one has an infinite (until shot at) duration shield that replenishes itself at regular intervals. She also has higher stats than the basic version, and the 2nd skill reduces enemy stats.

Basically, if your enemies ignore Armor making AEGIS unsuitable for your frontline, these might work out better. SWAP Rippers are broken, but sometimes these will last longer depending on the specific fight you're gearing up for.