That is the question.

For those folks who backed the 5E version of Mutant Spawn of the Toadmother, here's the big question: Do you want 5E (2014) or 5.5E (2024)?

The main differences from a design perspective are in the monster stat blocks and the character backgrounds. There will be some mechanical differences, but they won't be huge.

Because of the unique starting point of the adventure, players will be encouraged to choose a background from those provided in Mutant Spawn of the Toadmother. You may have been a noble, a sage, or a soldier, but now you are a refugee, a derelict, or a goon. Hardship has knocked you on your back and maybe given you some interesting new skills.

Backgrounds differ mechanically between 5E and 5.5E, so we need to know which path to take.

In 5E, backgrounds affect your skill proficiencies, additional languages, equipment, and suggested characteristics, and grant a unique feature.

In 5.5E, your ability scores, origin feat, skill proficiencies, tool proficiencies, and equipment are affected by your background. 

It's your call. I have my opinions, but this is your adventure, and you should decide. Keep in mind that 5E content is supposed to be compatible with 5.5E, but 5.5E is not very compatible with 5E. As a result, I'm putting my thumb on the scales—a two-thirds majority will be required for 5.5E to win.

Let me know in the comments how you feel about this. I promise to ignore everyone equally.