In R, there are two main packages for estimating mixed effects models: nlme and lme4. They have certain differences. (There are also other packages.)
In 2010, we had a well-received question: How to choose nlme or lme4 R library for mixed effects models?
In 2013, we had a follow-up question (lme and lmer comparison), referring to the earlier question and noting that the answer might have changed in the intervening years. (The consensus appeared to be that the earlier answers were still valid.)
Now it's 2016, and I'd be interested in whether the situation is still as in 2010/2013. (Specifically, I'm most interested in panel data as per the 2013 question, but I'm also interested in any other changes in the differences between the packages.)
Should I just ask a new question, referring to the earlier ones? Or do something different?