price and straightness. axis is more expensive, but straighter by a small percantage i do believe. weight may be different. i shot epics this passed year. i dont have anything to compare them to...but they held up to 1000s of shots(i can shoot out to 40yds in my back yard and do so verrrrrry often) for the price id say they are a good arrow...i had no problems with them. call me crazy but out of 10 i could screw broadheads on all of them and shoot them all in the same group...had no problems with them flying different like i hear stories of...im only switching because i dont like how light they are...

alot of guys here shoot axis...they will chim in im sure...i cant say i remember hearing any complaints about them