904 lockup vs non lockup

The mid 70's are the best 999's with the 5 clutch front drum and non lockup.
Is it your opinion that a 70,s 999 is better because it is non lockup, or for some other reason? A 1980,s is a 999 with lockup, but I believe it has better(stronger internals) than the earlier 999. I just wondered if you could tell me why you feel a 70,s is better. The 1980,s version uses 4 pinion steel planetaries.