Sorry for double post but phone.

Who contributes more? A tank that stays alive in tank stance and keeps aggro and does mediocre damage or a tank that does the same except they forsake aggro generation ( keeping aggro, but with a smaller lead + shirk exists) to maximize their dps and add to the overall damage output.

Also, having done both - Tanking bosses in dps stance is far more engaging. I actually have to look at the aggro list, see if i might have to change and put a halone in.

For Practice or fights that you have difficulties with, 100% tankstance uptime is ok, but if you feel confident then try the other one as well