DVD upgrade questions for G4

[Numo]

I am upgrading a G4 450 Sawtooth and have several questions about adding a DVD burner:

1. Which drive: Pioneer DVR-110D or Pioneer DVR-111D? (each about $38)

2. Internal or external: make any difference?

3. Will I be able to burn CDs and DVDs natively from OS X 3.9 or will I need addt'l sw?

Thank you!