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Does anyone What the differences are between the 2.1 and 3.1.

Cheers

2.1 is the older version but still very good 3.1 is more refined. I use a 2.1 1s in my 1/12th car (blinky) and in my outdoor TC (boosted) with no complaints other than needing a PC to change from Blinky to boosted but don't do this often.
Never had a 3.1 but they are supposed to be much better

To start with it will be doing blinky indoors and outdoors blinky. But I can see it being an issue if you can only change settings with a laptop

Not sure what the difference is but I have a 3.1 and it's the best speed controller I've owned.

That's a good enough answer for me.
Cheers