Both are great hot tubs, very powerful jets in both models. Despite the exterior dimensions, the Epic actually has more room and a larger footwell the way it's configured. As far as popularity, the Epic outsells the Show 10 to 1 approximately. MicroSilk is a really nice feature, which you can get in the Epic. I own a 2007 Epic and it looks brand new, all original equipment (nothing has ever gone wrong with it). The only thing I have done is replaced the cover about a year ago. Let me know if you have more questions on the Marquis.