It's hard to convey what I mean exactly by listing features, it's best if you use it yourself. Next best thing is to watch an expert use it.

Wolfram has released good videos to that end, here's the latest:

https://www.twitch.tv/videos/569938853

I find R to also be a lot better than Python and closer to Mathematica (especially if you combine it with RStudio and Shiny) but still not quite as good overall on the interactivity/environment end.