Hello mfranco_iov, Since you have a dell ML6020 with IBM drives in it we would recommended that you use Fuji tapes as they are recommended by the manufacure of the drive to get the best results & longest life of your drives.  You can use the other media brands as they will work in the drive it is just that when not using the manufactured preferred media you can get results & performance that may be less than using manufacture brand.   Please let us know if you have any other questions.
Anyone have a preference for LTO5 media from Sony, HP, Quantum or Fuji for IBM drives in my Dell ML6020? Any advice would be greatly appreciated, I have had some issues with Sony and HP lto5 tapes but I recall someone telling my that Fuji worked great.   Thanks!
Suggestions for LTO5 media manufacturer