For me it's: Adventure > Tamers >> Savers > 02 > Frontier >>>> Tri.
I love both Adventure and Tamers, but the emblems were IMO a genius storytelling device to use in a kid show in order to make character growth easy to understand.
For Frontier, getting past the human/Digimon as a concept can already be too much, but the terrible last portion kills the ability to recommend it.
Which is too bad, because if you chuck your Digimon expectations out the door, up until the Royal Knights is pretty strong.
Yeah, I remember it being kind of interesting. The characters showed proper growth in the earlier part of the series, but everything from the Royale Knights until the very end is as boring as it can be. You could summarize a lot of episodes with the following 4 sentences: The kids went somewhere. The Royal Knights went to that place. They fought. The kids lost. Repeat.
Imo, Digimon is at its best when it constantly does new stuff. I find 02, Tri, and Young Hunters to be the weakest parts of the franchise.
On the other hand, Tamers, Savers, and Appmon are among the strongest and each took a risk in some way.
So I'd rather have a new anime. However, I won't complain if Adventure 4 ends up good and they give us a new Shakkoumon evolution.
I need to watch Appmon, people here has praised it for a while and it sounds like an interesting reimagining of the original premise. I fully expect them to go to the "classic" Digital World in the middle of the series, but it can be interesting seeing it interact with these new and different species.
I agree with your post, overall. Frontier felt like a "well, people loved Tamers Megas, so lets give them 50 episodes of that" without realizing how important and special the partnership between the kids and their digimon is to the series. I've never had much of an interest in Xross Wars for the same reason, since I feel it dilutes that idea with the army concept, however, and I may be wrong with that one.
I don't have much to say about Frontier, but the biggest problem with Adventure 02 is that it doesn't know what it wants to be. At times, it wants to be something new and reduces the older Chosen Children as little more than glorified cameos. But a few episodes later, it decides that it wants to be a direct sequel to Adventure. Then the original CC eat the new ones for breakfast, because they're much better developed and charismatic characters than the new ones (but Ken), so the writters lose their shit and create an excuse out of nowhere to bring them back to the sidelines.
Despite of this, there is quite a bit of interesting stuff in 02, to give some examples:
- BlackWarGreymon, to give the most praised example.
- The part where they traveled all over the world and shown how there were Chosen Children everywhere was genius in a "you may get a Hogwarts letter in your 11th birthday" way.
- The Daemon Corps could have been tied to the Dark Sea and the Dark Seeds and turn into a good end-game villain.
But it fails at crafting a cohesive series, because it's too busy in its own identity crisis. The sudden move from the Daemon Corps to fucking Myotismon shows both this and the utter lack of confidence the writters had in their own product IMO.
I'd still take it rather than Tri, however. I'd say that at least half of 02 is above average, even if flawed; but I'd burn everything but the 3rd Tri OVA. What a waste of time.