Best firmware for 3500ag

which is the best firmware for the 3500 using 2tg is 21b a better choice? Thanks for any advise

Well I’ve had 2TG in since it came out and only ever burn on 16x Verbatim DVD+R and 2.4x (@ 4x) Verbatim DVD+R DL media and not had one coaster!!

That depends on whether you use any of the media codes that are supported in 2.1B and not in 2.TG.