The last time we visited Paris was in November 2017, relying strictly on public transportation.
We are flying into CDG on Saturday morning, November 26, and flying out on Wednesday, November 30, and will be using public transport again--primarily buses with an occasional jaunt via metro.
Since we will arrive on a Saturday and leave on Wednesday, essentially 4 public transports days before heading back to CDG, I am having difficulty determining our best and least expensive card or tickets to purchase for public transport. (I realize that we need separate tickets to and from CDG, so not including those.)
Suggestions, please...and thank you.