You can't really judge VW based on the limitations of a specific device. There are VV devices out there where you can only adjust between 3 or so predetermined voltage settings, that doesn't mean VV in general only allows you to do that.
The DNA mods change by .1 watt, that's far finer than any VV device on the market. So if we are going to judge VW and VV by specific devices, VW offers more fine tuning than VV does. But that's not really an honest way of comparing the two.
Both have their advantages in certain situations. On devices like the Vamo, Zmax, etc you can get more power when using voltage mode compared to wattage mode. With stacked 18350s, in voltage mode, depending on your resistance you can push 20+ watts of power while still coming in under the device's amp limit. In VW mode, the device obviously limits you to 15 watts. In VV mode you are only limited by the available voltage and amp limit of the device.
Also, when using RBAs, the whole wattage advantage (set and forget) starts falling apart even worse than when using commercially produced coils. It's a huge hassle, for me personally, using VW with RBAs, as wattage means next to nothing when you have so many more variables compared to commercial stuff. Set the device to 10 watts, one atty I build to 1.5 ohms will be hot, the other will be cold. Resistance isn't a reliable way of "measuring" an RBAs, and resistance is the only variable being taken into account with VW calculation.
It's all just personal preference and depends on your own vaping style and setup, and the specific VV/VW device being considered.