Which is better 6.3.1.20 or 6.6.01

Which is better nero burning rom 6.3.1.20 or 6.6.0.1. Is there such an improvement between the two or are there to many bugs in 6.6.01

i am about ready to throw in the towel on 6.6.0.1 - i cant burn direct to disc anymore- i have to thru image recorder in NV3 and then burn the image. another bug i am trying to figure out is that only 2 chapters work out of 3 - i can’t get a third chapter! the third menu button, no matter what i put under it, never plays. i was really stupid and upgraded knowing i had a deadline. but i have never had a problem with nero updates before and things were working well. i dont think i have saved the old downloads - it was months ago - and doing a restore will break other things i have going on. i just dont know at this point - hoping on wisdom from this forum…
jigs