Stack wagon or accumulator good and bad

I am only going to be baling about 15ac of square bales midland 99 bermudia so my yields should be pretty good. I do everything by my self and was wondering what would work better for me as I will be stacking all hay in a barn that is in the same field I will be baling. I have a grapple already but can't decide what to buy or build next as a small stack wagon and accumulator are about the same cost. I guess what are pros and cons of both and what seams to work best for everybody.

Stack wagon or accumulator good and bad