Basically, my question is this: If one throws flavor aside and is building a combat practitioner, which is the most useful skill to have as a peak skill? Discipline, Lore, or Conviction? I am primarily interested in Evocation based builds, but would also like to know if enchanted item based builds are actually better.
From what I can tell, Discipline should almost always be the peak skill in this case. It allows the most optimal use of one's stress track (Conviction, Conviction+1, Conviction+2, Conviction+3), contributes to accuracy and damage simultaneously, and applies to evocation and enchanted items.
This is assuming Conviction is at least Good (for 4 stress boxes), but that's a reasonable assumption at almost any power level.
Peak Conviction really only gives you that extra consequence at Superb, but means you're more likely to take stress or be casting sup-optimally because of your lower control.
Peak Lore gives you the best enchanted items, but without Discipline high, you're not as accurate with them.
Ideally, you'll have two top spellcasting skills, but if you can only have one, which do you think is best?