Read the fine print on the PDC warranty: So long, but see what the payout is. That is the key. I used to sell PDC swim spas and while I enjoyed the quality of the product, I disliked how the warranty misled the consumer. Not saying PDC is a bad company or has a bad product. Just read the fine print on the warranty.
It might behoove you to travel outside of your radius to find someone "local" who can:
1. Have a spa that you can physically see, and sit in, and hopefully wet test. Make a day (or two) out of it. $6000+ is a lot of money to invest site-unseen.
2. Can service your product. Buying direct tends to mean that you're going to either have to find your own service people (which is not easy and you have zero leverage), or some guy is simply outsourced and he has both you and the manufacturer over a barrel b/c its either him or nobody.
3. Delivery could be had - and not a drop-off to your driveway.
These are gigantic aspects that you really need to place front and center in the decision-making process.
Again - Not knocking either brand. I used to sell *both* brands and I think they are of quality. Just think you need to see if something else is out there that could address these needs for you vs. going off of pure faith.
I hope this helps. Good luck moving forward.