I'm late to the latest "volume-weight" discussion, but the whole reason I went to weight was because when I make 50-120 ml batches, I found that measuring with a graduated cylinder was a PITA (IMHO), especially with VG. If you have a 1-3 ml syringe, yeah it's pretty accurate. A 10 ml syringe, less so and VG is harder to suck up and dispense. A 25 ml graduated cylinder for VG was for me a) not that accurate, b) took awhile to pour out without spilling and some was left over, c) took at least two fills to get more than 25 ml of VG, and d) I then had to go clean it and a funnel.
And diluting 100mg nic to 30mg in 250 ml bottles is really easy too.
Just like everyone prefers different equipment, coils, wick, flavors, etc., do what works and makes sense to you. I don't think you are likely to be able to tell the difference if you tried the same juice made by volume or weight. I wouldn't recommend mixing 120 ml of your ADV by drops though, unless you are nuts.