It really depends on your class. Wizard needs as many worlds with fire and ice weakness to use arcane spell as effectively as possible, so I go embers edge (it has a lot of rooms that are skipped), mount whirl, fungal jungle (cause parasite droids are weak lol), gingerbread (because it has a lot of rooms that are skipped), elemental heights, chill hills, overpower plant (because it doesn't have crystals), midnight casino (it is surprisingly easy), and skytop citadel (because it doesn't have too many different room types, and a lot of them have pyro or cryo droids or are skips, also no acid)

I am in the process of making a speedrunning tutorial if you are interested in hearing more. But this is generally my go-to world choice for speedrunning.

Also, different classes have different world choices. For example, for relic I change gingerbread out for lavender Alps and embers edge for sandy.

For bloodmage, I change out casino for mech and usually also skytop for atomic. Also sometimes embers edge for sandy canyon.

Some world you NEVER want to speedrun include: echo, stone, junkyard, scorpians, dragon (if you are on mobile), and crystilline. They will most likely kill your runs pace

If you are speedrunning without world selector I genuinely feel bad for you. I would go insane if I didn't have it. If you wanna speedrun it's worth the few bucks if you can spare it.

I can see both sides, but you guys are missing one of the biggest points. There isn't a big enough speedrunning community to sustain so many categories.

Lets go gambling!!!!!!!