Facts comparing these two,
1. Toshiba is the superior CD-ROM performer of the two because it's rated at 48x compare to Pioneer's 40x.
2. Toshiba is the better digital audio extractor of the two, averaging nearly 23x. The Pioneer is locked at 16x.
3. Toshiba is the quieter of the two.
4. Toshiba reads sub-channel data and is the best reader for CloneCD. Pioneer does not support sub-channel reading.
5. Pioneer is the faster of the two in playback/encode DVD movies, Toshiba locked at 2-4x in movie playback, very slow for ripping purposes.
6. Pioneer has a cool slot load, Toshiba doesn't have headphone jack and volumn control on the bezel.
If slot load and DVD ripping doesnt matter to you, go with the Toshiba by all means. With that said, I have both DVD-ROMs and I've used them a lot to know which is the better. There is no perfect DVD-ROM in the market, you really have to split hairs and find out what's important to you, simply going with the most popular vote is NOT the way to purchase the best DVD-ROM for yourself.