Does 3ds or ds matter

Not at all, it's really personal preference or whatever you have available!

https://www.speedrun.com/mlpit/guide/jyp1s

• Posted a guide on version differences yesterday, with a bit about that as well. There are no differences as far as any of my tests were on lag, the only difference is preference on buttons. I do find 3DS buttons easier to mash on, but that's me.