I'm baffled about the price variation and selection too. A few years ago I ran a waxing Groupon offer and bought lots of different strip wax to try. I found some waxes were trickier than others, and some glided on thin whilst others were more expensive in wax costs. I guess it depends on your waxing style. In then end I settled on an inexpensive vegan product which has natural ingredients. I find it less sensitising for clients and very economical in use.
For hot wax I use outback organics which I find very economical in use and my clients love its feel, aroma, natural products and ethical back story (or maybe my enthusiasm for the brand!). I get roughly 8-10 intimates to 500g which is better than a lot of other brands. It does need training though, I went to some training demos at beauty shows and paid for their training course when they restarted offering training.
I am open to other waxes though - for me, I'd be interested in a wax that gave me a thorough but speedy job. I struggle to do an intimate in less than 30 minutes from client arrival to payment. If I could get that down to 20 mins I could fit in another wax an hour which would be awesome - great for ladies booking a lunchtime wax and good for my profit too.