every time Ive played the DA as templars, I have won.
however, he always playes ravenwing/deathwing against me.
bring lots of devsquads and lots of tacsquads in razorbacks bring a cheap captain with a stormbolter, or combiplas. cause when he gets into combat he wont win, but he can provide rites of battle for target priority.
bring an anti infantry dred, and no more than one squad of termies. the dreads should act as a counter charge, hiding behind a devsquad and then charging in after they get charged.
spread all your squads out as much as possible, and combatsquad your devsquads so you can have them seperate, with 5 man and 2 heavys in each squads. they aren't likely to tie up a crusader squad, as they will probably just get killed outright, so when they charge a squad and kill it, you can shoot it with your heavy weapons afterwards.
HOWEVER, this will probably make for an unfun game for the templars, so if you want to have a fun game for both of you, bring an assault squad instead of a devsquad and run it out to meet him. there will be an epic clash out in the center of the table, then about half of his crusaders will die, then lost of shooting will happen with more death, and a close game/draw will be had.