I used Odin Project as well as FreeCodeCamp when I was starting quite some years ago. I recommend FreeCodeCamp over Odin Project if you're going to only use one but highly recommend both for different styles of learning. FreeCodeCamp had at the time (which could have changed now) a much wider range of things to learn. Odin tends to send you off on your own to read different things from different sources which isn't a bad thing by any means but to me it felt less structured in that sense.
Either way, check them both out. Odin was more Ruby language centric too IIRC.