Is it better to have acrylic window inserts than storm windows for soundproofing?
Although this may be some what an opinion based question shopping questions are off topic. Storm windows create a extra air chamber and do a good job of dampening outside sound if properly installed.
I don’t know if I would want acrylic windows unless sandwiched with glass because acrylic scratches so easily but you may be talking about a window technology I am unaware of.