Perhaps you plan to burn audio cd ( 36X DAE average for Lite-On ) or DVD on the fly so you should use the Lite-On ? Plus Lite-On drives can read 90 and 99 Minutes cd whereas Teac drives have problem to read them ( i don't know if your pioneer can burn 90 and 99 Mn cd ) . Lite-On drives can copy better protected cd ( Teac drives are awful for copying protected cd ) .
On the other hand Teac drives have a good writing quality ( i don't know pioneer writing quality for cd ) .
Both Teac and Lite-On drives have good access times .
If i was you i would keep the Lite-On DVD ROM drive but i am not you and since i have made a small review on a Lite-On DVD ROM drive i am not objective .