I actually switched back to Rstudio, which has everything ESS has to offer (eg helm style autocomplete) plus much better autocomplete for tidy verse pipes.
I have not really used Rstudio, so I can't compare. I tried RStudio first, but then I was up and running with ESS effortlessly and have looked no further. Its the integration of Emacs with other development enviroments that keeps my life simple :-)
Could you clarify what you mean by "integration with other development environments"? I assume you're in data science -- could you describe how Emacs solve your need?
Also, am I correct in thinking that ESS company-mode autocomplete does not autocomplete data frame's variable names when using tidyverse's pipe?
Late response, but I moved to Emacs after being a very happy user of Rstudio for many many years.
Rstudio is a better editor for R. The problem is that it's a worse editor for everything else, and these days I write plenty of else, too. Being able to flip between different files, language shells, terminals, magit buffers, etc. effortlessly, makes putting up with worse autocomplete in R a pretty good deal for me. It does annoy me a little, but R is hardly a verbose language, and elisp is high-level enough that I have a shot at extending / changing the behavior if it really bothers me.
Perhaps I'm missing some killer ESS features?