Maintenance for the week of March 10:
• [COMPLETE] PC/Mac: NA and EU megaservers for patch maintenance – March 10, 4:00AM EDT (8:00 UTC) - 10:00AM EDT (14:00 UTC)
Breton is the strongest choice for Mag IMO. For Stam you should probably go with Orc for damage, or Redguard if you find that you need more sustain. Or you could go Dunmer and be able to play either Mag or Stam (while being 1-2% weaker than the other options listed above). Khajiit isn’t a bad choice either, but they’re not the best at anything, and I find they synergize better with other classes than Templar.
I play a Woodelf Stamplar, hit like 47-48k on a parse with fracture. Which isn't too bad. Just pick a race you enjoy and stick with it. Getting high dps is more about skill than anything else. Yes, specific races are better: Breton/Altemer for Magicka and Orc/Redguard for stamina, but that doesn't mean you have to pick them.