Black Templars are the first Space Marine Chapter/army I ever used. My opinion is going to be biased because I've never played or even seen
SW deployed.
Templars trade the balance of a regular chapter for the ability to adapt to unique roles.
- Templars are good in assault, I've had a templar chaplain stand toe to toe with Old One Eye(a nid Special char)
- Templars can adapt to a shooty role very easy. Between cheap heavy weapons like lascannons for 15pts, to having 5 man plasma cannon squads shredding enemy infantry.
- Templars use Vows, which vow you use can change the whole flavor of your army. Accept any challenge, no matter the odds, is a vow that allows Templars to hit on a 3+ in close combat.
- Templars have a very easy paint scheme. They require little work at all to look good in a group, allowing you to finish a Templar army in no time.