I have not ridden the vinyl, but I do have a byerly (that I have not yet ridden either). I will tell you that the byerly has some pretty extreme top features...I think the vinyl seems a bit more mellow in that department...that board also doesn't seem as bulky. Since there's not a lot of information about it on here, I would recommend checking out wakeskating.com for vinyl info. lately we've had a lot of dudes post some opinions about it, and I think you'll get a better idea that way.
Also, there's a thread on there somewhere that has some nice pictures of the features from both decks (byerly and vinyl). Good luck either way, though!