You really can't go wrong with either format at this point in time. I have the pioneer 104, a 2x drive (.5hours per disc) and have nothing but good things to say about it. Yes The SONY's are good drives; the pioneers are also excellent choices. Shop around.
Also if you have a DVD player you'll probably want to make sure it's compatible with which ever drive you get. dvdrhelp.com has a list of virtually all standalone dvd players and their compatibility.