I've already shown how neovancian isn't relevant, because even if every spell was used for combat, it can't match the 3.5e wizard in combat. And even if some of those spells are used for non-combat, so will the 3.5e wizard, because they prep commonly used non-combat spells, not obscure ones like Wipe Nose of Dragon or whatever. The versatility isn't relevant, because it fails to be good enough to match the 3.5e wizard even with that versatility in slots.
So first, I play both 3.5e and 5e to high level, including 20, so it's relevant. Second, It doesn't matter, because the 3.5e wizard wins at low level as well. Look at 5th level.
The 5e wizard has 9 spell slots and 9 spells prepared to pick from. I'm using 18 Int for both. The 3.5e wizard has 12 spell slots that can be up to 12 different spells, which include combat, commonly encountered utility, and/or hybrid utility/combat spells. That's much closer, yes, but it's still 25% more spell slots and it's likely that all or almost all can be cast before the next rest. As I mentioned earlier, vancian wizards aren't in the habit of memorizing spells that are unlikely to be used. It's highly unlikely that the vancian wizard would have more than 3 spells unused, so at a minimum he's equal to the 5e wizard and on many days will be better and use 10, 11 or 12 spells.