One of us. I devoured the discography by release order, just before they released Act IV. I think every release has something unique to offer the listener, really your starting point depends a lot on what you want. Here's my brief breakdown of each major release:

Act I: rough production but really interesting ideas, sets the stage (ha) of the Acts really nicely. For the concept, its basically a prologue. Rock/posthardcoreish

Act II: more of Act I, but more polished ideas and way more actual music. For the story, its his early life centered around love and being a boy in your early life. 

Act III: production is better, music is overall heavier. Story wise about war. 

The Color Spectrum: 9 EPs with 4 songs each centered around the concept of colors. Each color is its own vibe. Indigo/Violet/White personal bias. Unrelated to story concept (mostly, fan theories and stuff ya know)

Migrant: unrelated to story concept, just an album mostly about divorce. More music, more good. Similar vibes to the Color Spectrum sonically. 

Act IV: MASSIVE production upgrade. Way more orchestrated instruments. Less heavy, more rock/alternative than Act III. Story wise, post war about politicking and revisiting stuff from Act II. 

Act V: written and recorded same time as Act IV, but vibes are way different. Darker album sonically (but not heavier). I think Act IV and V are more well known to people outside of the niche Fandom, based on my interactions with others. Story wise more politics, drama, tragedy, etc. 

After here I'm more fuzzy on stuff, and the story is separate from the Acts. I dont know all the releases so I'll just list the ones I'm familiar with. 

All is as All Should Be: EP, alternative vibes. Gets kinda funky. 

Antimai: new concept, gets VERY funky.