Which ever ones are on sale
I have shot a number of different ones(Beman ICS, ICS Bowhunters, CX Heritage, Axis, mfx, Goldtips) and have found that all of them fly true and hold up well to impacts. All of them will last a long time as long as you don't shoot them into rocks or cinder blocks. None of them hold up well if you do.
I really like the Beman ICS Bowhunters because of their cost. I have not tried the AD's or the Grizzlysticks because as you might have guessed, I am way too cheap.