Based on customer reviews on both amazon and Newegg they seem to be pretty decent and get much better reviews than the 3tb western digital green. I have had both WD and Seagate and haven't had problems with either.
That would be good in a server.. just a wee bit cheaper per GB than the $90 2TB WD that newegg had earlier this week. Great deal. Hopefully this is a sign that HDD prices are retreating.
3TB Seagate is a more modern design with a higher platter density and much faster performance.
This drive is no contest a better choice over a 2TB green for me as it's speeds are much faster and the cost per GB is much lower. It's not at all an energy hog either so the cost difference there over a green is almost nonexistant.