Is there any difference between Vinylex and 303. I plan to use lexol or SWISSOL products for the leather parts of the interior (any one had any experience with SWISSOL leather stuff) and either Vinylex or 303 for the vinyl parts of the interior and the soft top.

The vinyl is in excellent condition (car is only 1 year old) other than what look like a few water marks on the top of the door trims. Does Vinylex clean better than 303?

 

both are good products and its completely personal preference. i use both, but have been using vinylex for a very long time...
my preference is for vinylex. to me it goes on and off a bit easier (really not much diff)- and seems to be easier to "adjust" the shine.
i like lexol (note that you need both a cleaner and a preservative)- also like the townsend leather products.

where exactly are your water spots? did you try a little vinegar on them? that should cure them unless they have etched- if so you will need a much more aggressive product.