As far as I know the only way to tell is make a new F2P account and log in to see which is listed topmost.
Checking server stats shows Nimrodel as having the most logins/players on in the past 24 hours, so either it is or was the recommended server. In another thread, someone listed their server as being it and it changed one week later. So next week I expect Elendilmir to be it, as it's currently the lowest.
"Sometimes survival comes down to not being hit. Actually, most times." -the chicken skill, Bob and Weave