I make it simple for everyone.
There are 2 types of templar: str templar or int templar.
Str templar: means ur main status would be str for damage and vit for survivability. Ur main damage is from combo, in that case you will need to take the upper skill tree which is geared toward your combo damage.
Int templar: ur main status is int for damage and vit for survivability. Ur main damage is from skills: means u need to take bottom skill tree.
Your status growth will be:
1 str : 1 damage
1 int : 1.5 magic power
4 sta : ur hp increase ( i forgot how much is the value)
1 sta : 1 def
Your best equipment will be either str based equipment for str templar or hybrid type equipment for int templar.
In case you dont have hybrid equipment for int templar you should go for str equipment because it will provide better damage output.