Swix is kind of specific temp wax, has 8 different temp range wax bars. Have been using it for a while, and it does the job. Surely you can see difference waxed and non waxed skis.
Grabbed some DATA wax bars, so could wax them skis every one ride - cheap to use, 600g (16 bars) - 24GBP.
If you are a racer, you might wanna stick to swix. If you want to preserve skis and ski faster, grab DATA.