Once you get used to it, you will probably find track up the better. After takeoff, unless on a radar heading, you want to establish track asap. If you suffer and engine failure on takeoff, you will find just flying the track number at the top of the EHSI will make for accurate control - try it in the simulator. The only reason I can think not to use track up is if your company SOP prevents it - in which case they should deactivate it to stop you being tempted towards its advantages...