TECHNICAL ECSTASY because it's actually a very good album to listen to from the first track Back Street Kids to the last track Dirty Women and everything in between!!.
Although-
SAD WINGS OF DESTINY was an important album for Judas Priest and was a 'bridge' between mid 1970s heavy rock towards the future of late 1970s & early 1980s heavy metal plus it was also a good album to listen to as well but TECHNICAL ECSTASY just wins out for me.
E-Z