Agreed!
A lot of my customers like to hang out in the garage with me as I work and I will show them the products I am using, explain why I'm using them and why they are the best. I dont think I could say, "this is the Best wax out there" if I had only tried one or two. As for polishes, most customers dont know too much about them, so trying out different ones is really for my benefit.
Personally, I use the following LSPs to achieve the look I desire:
Four Star UPP- slick, shine, durability
Souveran- Black or red car depth and shine (charge a premium)
Nattys Blue - Darker car - wetness
P21s lighter colors- ussually just leave lighter colors with a sealant, but should the customer want p21s is the best wax for lighter colors imo
Zaino - for the hardcore zaino fan customer
EX-p - leftover (use in case Im out of 4star)
RMG - dark cars, use when customer desires (for a premium)
I kow I have a few more, but really those are the LSPs I use and to be honest, I use them all a good amount.