Definitely buy the balanced phono lead. Your cartridge is a balanced device.
If you have a balanced phono preamp chances are it will sound quite a bit better on the balanced input/output now that you have a balanced input on your preamp providing both are balanced designs and don't simply have the XLR's thrown on for show.
If you have a balanced phono preamp chances are it will sound quite a bit better on the balanced input/output now that you have a balanced input on your preamp providing both are balanced designs and don't simply have the XLR's thrown on for show.