The sound quality of the PRX 4 is not as good as the Tascam and with the Tascam you have the added advantages of Tape compression and warm analogue sound.

However it is not digital and that means that if you want to put your stuff on a CD or on the web as an MP3 you will have to convert it You also get things like virtual tracks with the Korg and that offers the possibilities to do non destructive sub-mixes which open up the possibilities to mix down more than 4 tracks with out having to record over anything. Also Bouncing digitally does not reduce sound quality.