I’m starting from the beginning. What decade is considered the best?
That all depends on what you like about the comic. The early gangster-thugs, the science fiction, the personal tragedies, the multiple cameos from other strips etc.
I’ve never read Dick Tracy.
Frazz
Brewster Rocket: Space Guy
Currently running?
Sally Forth. It’s just so meta and clever.
Big Nate
Brewster Rockit
Lio
Dilbert
Forgot to add Rhymes with Orange
I can’t advise you on the best years to collect Dick Tracy if I have no idea what types of stories interest you.
Order of the Stick
Pixie Trix Comix
Full Frontal Nerdity
Saturday Morning Breakfast Cereal
Least I Could Do
Dork Tower
Oglaf
plus a number of the ones mentioned above.