40 databases exist on SQL 2008R2 64(OS2008R2) bit dedicated server.
there are 3 drives.
Data Drive 200GB.(37 GB is what is used for data files)
Log Drive 100 GB (27 GB is what is used for log files)
16 GB RAM
2 Core CPU.
The performance is fine.
Now the server is being shifted to another service center, and the choice is up for upgrading all the 40 user databases to either SQL 2012 or 2014, after sufficient testing will be done in the labs.
THe hardware resource would be similar in the new environment, and perhaps quad core instead of dual, being the only potential difference.
What would you see as the essential pros and cons of either migrating to 2012 or 2014 version in the new server.