ha ha ha I love these arguments. its just opinion vs opinion all the way & you will never come to a conclusion that will satisfy everybody.
Personally, I have found that a more ridged or stiff system tends to give superior tone & playability. & no I am not saying that a trem ruins tone by adding stretchy springs before anyone jumps on that one. I mean you need a neck & body that have very little movement - if any at all.
I have always found that guitars I replaced necks on because they had what I call "disco necks" - moving about a lot, always needing the truss adjusted etc. etc. sounded better with the new stiffer neck.
Similarly, Ibanez & Jacksons I have made thicker necks for seem to benefit from having additional mass in their new necks. Although this may have a lot to do with the new neck being more ridged than the original also.
Regardless, discounting the individual species of timbers used. I believe that a more ridgid neck/body system is always going to give better tone, playability & sustain. the fact that it may be laminated or is a single piece has its own pros & cons that only add to the complexity of the arguement & complicate things. So I wont get into that.
But I do think that more neck is the way to go, I dont feel that a 17(nut)-19mm(body) thick neck is doing the guitar justice tonaly. My minimum is 20-22mm, with a preferance for 22.5-25mm on my electrics with a 44mm wide nut as standard.
My acoustics have a 23.5-27mm neck with a 47mm wide nut.
A customer explained it like this to his friend "what would you rather be swinging in a fight, a pool cue or a baseball bat ?" sometimes bigger is better.