My current tournament list has 72 skinks and 90 (3x30) Saurus but our tournament scene has a lot of comped and restricted tournaments so the lists are generally very different from ETC or unrestricted tournament lists. It generally depends on what you enjoy playing.
Lizardmen have always excelled at shoot and avoidance though so people tend to lean more towards skink heavy lists, as it's generally considered to be the stronger list.
To answer your questions more directly: Skink based S&A lists is generally considered better all comers lists, often with 1 big block of Saurus and a ton of skinks. Light Slann can make the Saurus horde into a very competative choice, but it will probably never be a cookie cutter build unless the 8th book comes with some pretty dramatic changes.