I prefer to use network line endings because that is the standard netowrk line ending, and because quite simply there will come a day when your file needs to be read by someone whos most advanced tool for reading it will be Excel. Likewise I tend to use csv so that cut and pasting from the file to an Excel workbook works correctly, not to mention the fact that for the type of data I use embedded tabs are never a problem, but occasionally embedded commas are.