I collect TITO's more by the backs then the fronts that fade. The backs are printing press printed in ink and will remain for years. The fronts are heat printed and will fade, however at various rates, I have some from 1999 that still look great and others only a couple of years old that are fading. The face value of the ticket usually expires in 30/60/90 days and thus should not be a collecting consideration.
The catalog I just issued list the tickets by back designs. What is printed on the front varies by what is loaded into the computer servers that control the printers and thus varies from machine to machine, it is up to each collector to determine what subtypes they want to collect.