I am a feverent user of data.table and try to avoid dplyr when ever possible. I have colleagues who are exactly the opposite. No one cares.

If you want efficient code, try not to use dplyr. If you want readable code, data.table isn't the best answer. If you want speed, there are better languages than R to choose from, even with Rcpp.

If you want to get something done, go with whatever you know best and will do the job.

Avoid Stata.