Did my first training grounds run today and it went well, but they seemed disappointed I didn't know how to brand, and the sorc ended up doing it. It does seem like something the tank should be doing, so I'd like to know if any of you other temps have tips. What macros/key combos do you use for branding? What brands do you use? How can I quickly tab around between targets without targeting my damn party all the time?
As for OP's questions:
26.5 temp here. I use crit manastones on my GS, block manastones on my sword and shield, and HP+attack manastones on my armor itself, with +HP and +crit on my accessories. I use g.s. most of the time for solo play, and sword+shield for group stuff. To be honest I haven't given sword+shield I fair chance for DDing because I haven't invested in a good sword yet - I just haven't seen any that stand out around my level without being 3mil.
For stigmas I use IJ and Divine Fury. I wish I had swapped to roar for the T.G. run but didn't have my shards on me and didn't know where a stigma npc in the area was. Still new to the abyss

Been grinding the easy golems for my XP, think it's supposed to last until 28 or so.
I definitely think DD templar is the way to go for the time being. I was tanking yellow-orange elites in T.G. with the only +block coming from my sword+shield and had no issues at all with hate or damage taken, even on the boss. As for crit vs attack, I haven't really done a lot of testing on which is better, I just know that crit manastones sell fast for a lot more than other manastones, so I unload those on the broker for cash and use +attack on my armor personally. YMMV.
Another question - what's so great about holy shield? My understanding was it doesn't reduce the incoming damage at all, just makes the mob take damage when you block. With how short the duration is, that seems extremely meh to me, even if I full-timed sword+shield. Am I missing something?