The Axis are a smaller diameter with more options available.With the Axis you can get 50-75 gr. and 100 gr. brass inserts for them.With ST Epic's they are not available,you could use heavier points.But they are a 9/32" shaft,the heavest 9/32" point is 125 grs..You could use 5/16" points but they would would have a lip on them.That just make target reomoval a pain with a lip.Both are good arrows but the Axis would be my choice for a traditional bow with the more tuning options and I believe Axis are slightly heavier gpi.