My favourite one is Tamers. I like Adventure and Adventure 02 for nostalgia reasons.
Tamers imo had the best atmosphere, characters and story. It even dealt with some really adult themes and steered Digimon away from the monster of the day formula to having a deep overarching story.
Frontier was ok, but somehow I didn't like it as much.
Savers/Data Squat made me stop watching Digimon. I had a hard time stomaching the shift in artstyle towards something that looks like bad fanart and when I didn't like the story either I just stopped. Haven't gone back since.
I'm looking forward to tri though.
Ranking:
Tamers
Adventure
Frontier
Adventure 02
Savers







