While I am a big fan of the Vanguard, the Rangers are probably a notch higher when it comes to how much I like the look of them.
There's something about their coats along with their hooded heads that I really like. But since I preferred the Vanguard's rifles over the Ranger's, I passed on using Rangers as the main body of my force. But, that meant I got to use the Rangers for something even more fun.
Sniper squads.