https://www.nothingbutsharepoint.com/sites/devwiki/articles/pages/advantages-and-disadvantages-of-linq-to-sharepoint-over-caml-queries.aspx
Comparing columns is interesting..
Querying using generated entity classes are a bit on the slower side as they generate CAML internally....
http://www.pranavsharma.com/blog/2011/12/16/large-list-performance-spmetal-vs-spquery/
