Super Base was actually Armada's Leader Class, not Supreme which was called Chaos Bringer. Optimus Prime was the only mold for the former, and Unicron the only one for the latter. btw The current names for the Size Classes all came from Cybertron, Armada and Energon each had their own names

Speaking of different names for Class, Robots in Disguise 2015 has Warrior Class instead of Deluxe Class, right? Despite equal size, they're not the same: the simplified engineering compared to Generations results in a lower price point, necessitating a Class to accommodate that. I wonder if someone was pretty... I don't know, exact with that?
I kinda miss the Ultra Class as well, but I can see why it was seemed obsolete with the difference in size between maybe a bit too small to warrant its existence. Scout Class too, but the current Legends Class is a good substitute, even if they're slightly smaller.
And may I be honest? The sub-Deluxe Classes have been an absolute mess throughout the years when it comes to naming them:
- With the introduction of Cyberverse for DotM, Legends has been renamed Legion, while introducing the larger Commander Class, rendering Scout Class obsolete.
- After Cyberverse ended, Legion Class was kept as is, Commander got obsolete, the "Legends Class" name was redefined, twice for FoC and T30.
- Power Core Combiners, AFAIK, had
no official names for its two Classes. "Commander" only referred to the main figure in the 2- or 5-packs, and not to the name of the Size Class it's in. Ugh.
To finish up, a history:
Beast Wars to Robots in DisguiseBasic
Deluxe
Mega
Ultra
Super
Supreme
Armada, EnergonMini-Con / Energon Class
Super-Con / Combat Class
Max-Con / Mega Combat Class
Giga-Con / Command Class
Super Base / Leaders Class
Chaos Bringer / Supreme Class
Cybertron to 2010Legends Class
Scout Class
Deluxe Class
Voyager Class
Ultra Class
Leader Class
Supreme Class
From there, it looks like each line got its own Size Classes with some overlap (Legion, Deluxe, Voyager) between them, which complicates things a bit...
GenerationsLegends Class
Deluxe Class
Voyager Class
Leader Class
Titan Class
Dark of the MoonLegion Class
Commander Class
Deluxe Class
Voyager Class
Leader Class
PrimeLegion Class
Commander Class
Deluxe Class
Voyager Class
Weaponizers / Battlemaster Class
Ultimate Class
And starting with AoE, all bets are off with the One-Steps, 3-Steps and the like. In non-Generation lines, only the Legion Class and to some extent the Deluxe Class seem to have survived.