Pioneer DVR-216BK vs DVR-217BK

any major difference between these two?

is one better than the other?

Not too much. They’re both good. I have marginally better burns with my 116D than 117D, but that’s just personal experience and the SATA counterparts (216D and 217D) may be a different case.

Just as long as you don’t get a 218L you should be good.