Is there a superior leveling system to avoid lippage in tile flooring?
One of the newest and most comprehensive tile leveling systems on the market that I deal with is the Spin Doctor Tile Leveling System by RTC.  It is tool-less, can be used as spacers in addition to leveling, and is relatively easy to use.  RTC has a video on youtube video showing how to use it: https://youtu.be/NwP1OW1-7L0