Viking makes a relatively simple spa and from what i hear from a few of the independent service techs in my area they are an ok spa. We just picked up the Freestyle Spas which are now owned and made by Sunrise and I was pleasantly surprised in the quality. Given my positive experience with Freestyle so far, the fact that Viking has a prorated warranty, I would lean towards the Sunrise. If both spas work equally well for you then I would go with whichever dealer you are more comfortable with.