Which SONY burner is better? are they the same?

Hello everyone,

i’m interestedin buying a DVD +/- RW. here’s where the problems starts.
First i would like to know whether the Sony DRU-500AX is the same as the Sony DWU-10A. If not, please explain their differences. PLZ

second which one should i go for the LiteOn LDW400D, Pioneer A05 , Sony DWU-10A or Sony DRU-500AX ?

third, does anyone of the above burners have problems burning protected DVDs (PC, PS2)? if they do which one would be best? explain please as i’m fairly new to the DVD burner stuff.