I've owned both JBL and ADS - but not either of these two models. I'm an A/D/S guy, for the softdomes ... they tend to be less forward and I like that. Had a set of JBL L150s with a metal tweeter (035 Ti) I think it was. Not a bad speaker but I couldn't get that tweeter to settle down. That being said, the JBLs have name recognition ... might hold their value a bit better. I would lean towards the 1290's depending on the condition but I don't think you can go wrong either way.
Too bad all life's decisions aren't this complicated ...