yeah your best bet is to just ask your barber what he is using.. however. what works for you may not be the best for your customers to shave with.. so I would have an arsenal of creams and gels or oil..

I know in my shop a lot of the guys use promate shave gel for their Krisp lines and for most of their lining .. frankly I dont spend the money on the promate stuff but it does work well.. I use aloe shave gel when I use the straight razor to arch my daughters and girl's eyebrows because with it I can see every little hair.

and I dont know how this particular group feels about the Latherizer machine but my girl loves it to give shaves in the shop.