In my experiance stick with G04.
The G05 i have used have been pants....the backups have jumpy FMV's and this can cause lock-ups.
Also there pants for DVD movies in my experience.
There ok for PC game back-ups though
So to summarise there just pants, unless its for a PC
I had used Ritek Ridisc 8x G05. And a Sony DWU-18a (OEM Version of the DRU-530a) on a v10 PS2 with Matrix Infinity.
The best media i have ever used has to be the RiData ones with Ritek G04 dye. Rock Solid Reliabilty for any purpose.