Apples and oranges 
I still have the NS-1000s. The McIntosh amp is match made in heaven for them and the combo works extremely well. And the JBLs driven with that amp are not as transparent, neutral or accurate despite being monitors as well. However they do have some realism, scale and dynamics that NS-1000s cannot reach even when biamped (my friend has this type of system with optimized amps) with upgraded crossover. Overall I think I prefer the JBLs at the moment.
I'm bit undecided should I keep NS-1000s around or not. One pair of standard NS-1000M models I already sold but these domestic ones in near mint condition is something will not depart so lightly. I guess I should put some more effort to see what I could achieve with JBLs with other amps, and then make my decision as do not have space to keep both around, so that they could be easily swapped. I think the JBLs will be absolute killers with right amp and updated crossover as at the moment everything is original from the 1973..
Loricraft / Garrard / SME / Transfiguration / Dynavector / Ensemble / Auditorium 23 / Shindo / RA / Audio Note / First Watt / Duelund / Altec