believe it or not, our Occupational Therapist (OT) had us do both too.
both were ok, neither worked miracles. my daughter did the brushing/compressions herself and forgot more often than not, so compliance was an issue. but the brush was given to us by the Occupational Therapist (OT) so we have zero to lose--it was easy.
i refused to buy the listening program so we only did it during Occupational Therapist (OT)...mine liked most of it. (it was weird). we did it every session and used the Occupational Therapist (OT)'s copy and it was fine. it was ridiculously expensive to buy it, and frankly there was zero proof it would do anything. i was SO glad i didnt spend the $$$ on it. it just felt like the "trendy" therapy of the day to me...i need things with some kind of scientific data to back them up...not, "i dont know why it works but it does"....especially when i'm being asked to open the checkbook. (and dont misunderstand....i'd pay a small fortune for something if i thought mine would benefit--i just need some proof)
if you have access to both, there isnt much to lose. if i had to choose, i'd go with brushing over the listening program---not just for the cost, but there is some history behind it and its been around for decades now. plus, the brush is portable, easy to do in a few minutes, easy for a kid to do, etc...its just easy. in my opinion, even if its bunk, well, depending on the sensory needs of the kid, if they arent adversive, it feels good and involves a .25 surgical scrub brush, so why not, lol.
they'll only get out of either of them what they put into it, and if duckie is like my difficult child, the attention span and compliance to do either of them faithfully is questionable at best, so i'd be careful if Occupational Therapist (OT) is insisting you run out and buy it.
just my .02.
(and for the record, to date--Occupational Therapist (OT) has been the most useful thing we've done to date...i definitely saw results overall--its been time and money well spent)