If you know anything about Transformers: Armada, you likely know anout the somewhat infamous reputation it has with its rushed animation and dub due to the show airing six months ahead of its Japanese counterpart. Now Micron Legend isn't a drastic improvement over Armada in terms of story, characters, or even animation. While the scripts are more cohesive and the animation is overall better, if you were someone who hated the idea of the Minicons (Microns), couldn't stand the human kids, or couldn't get past the first quarter of the show for being too repetitve and boring then Micron Legend still isn't for you. I'll even say that while there weren't as many egregious animation errors as Armada, Micron Legend's animation still can look very cheap at times.
I will say as someone who grew up with the Armada dub, it took some time to get used to the voices of Micron Legend. Say what you will about the translation, but Garry Chalk, David Kaye, Michael Dobson, Brent Miller, and the rest of the Armada cast were fine in their roles, the somewhat stilted voice acting was a result of the lackluster voice direction. I also kinda miss the Armada theme showing up every now and again in the show. While I like the show's music, and I really like the two openings Micron Legend has, the Armada theme makes the show just a bit cooler during certain sequences. While thos goes without saying, many of the character names are different in Micron Legend (i.e. Hotshot is called Hot Rod, Red Alert is Ratchet, Optimus Prime is known as Convoy, etc.)
In all if I had to recommend which version of Armada someone should watch it would be the Micron Legend version. While I'll admit that I have a soft spot for the American dub inspite of its issues, I know that for many people the Armada version just has too many issues with its presentation. That said, I would like to see a remaster of Armada despite the fact that it'll likely never happen. A version of the show with the improved animation from the Micron Legend version and with the dialoge re-edited. There was a channel on YouTube called Queenbell Studios that was making an improved version of some of Armada's key episodes, but unfortunately those stopped a couple of years ago. As for now, If you're not fussed about some of the slight differences from the Armada version, or if you don't mind reading subtitles, Micron Legend is the better way to watch this show.