the other 11sp alternatives from everyone else..
SRAM NX is heavier and more expensive. I just got a new XT 11-42 and it felt quite light to me, I sure I will notice the extra £200 in the bank before I notice any weight penalty!
Re old v’s new, I think the old stuff was finished better (xtr was nice) but in performance terms it is no ware near even low end (ish) modern stuff. I have just rebuilt my dads Breezer with early 90’s XTR and it is pretty clunky by modern standards.
The value of modern stuff (XTR not included) is astounding. I bought a Marin Pine Mountain in 1993 for about £1000, it had deore/xt mix, crap wheels canti brakes, no suspension. In 2013 I bought a Scott Scale for £999 it had deore/xt mix, crap wheels great disk brakes, well dampened suspension, it was much better for the same price after 16 years!