Originally Posted by
C-Dog
I would hazard that that depends on what you are doing with the build!
If you are taking Fighter 1 early (Level 2-3), for 4 AP you can get the Kensai +8 to hit/+8 damage boost, which is just crazy powerful in lowbie Heroics, so leveling to ~around~ 8 or so (depending on your damage) is a cakewalk (and after that becomes weak you can respec to a +30% Attack Speed boost). If all you're doing is going to 20 and TR'ing, this might well make the overall process a lot faster!
Otoh, if you're going to 30, then, yes, the Core 20 might be better overall for the power it gives for 20-30. Doubly so if you're planning on parking there for a while.
A good Heroic TR build can be very diff from a good ER build.