For vacation rentals, I wouldn't suggest those premium and luxury level hot tubs.
The Jet Paks are not going to be cared by any of your renters. They just want something that looks good, feels good, and has good water.
X Series with the lighting package (back-lit jets) would certainly do the trick.
The Cloud control IMO disconnects to frequently to really warrant any value.
Make no mistake, the X Series is a great hot tub, and if you think the jetpaks are worth the extra $$ for you to use a few weeks a year, I'm sure you'll love it. However, from a rental perspective, I would get a quality hot tub that is simpler rather than more complicated.