There is really no question what so ever that nuclear is a far, far faster way to scale clean energy.
Compare the countries that had real phases where they build a lot of nuclear and it easily beats any renewables.
If Germany had gone all out on nuclear for the last 20 years, they could easily be finishing 5-6 nuclear plants a year, and likely get the construction time down to 4-5 years even if you built old school PWRs. Germany would be shutting down coal plants and end up 100% clean far earlier then their current way of doing.
If you however figure out a newer type of reactor (as we should have long ago) you could likely build 5x as many. The limiting factor in PWRs (outside of money) is the extremely complex construction of the reactor vessel. These have to be 'thicc' and are hard to weld, only few places in the world can do it.
Despite that insane reactor vessel France and the US managed at reasonably high production rate.
However if you go to something like a molten salt cooled reactor, or a molten salt reactor of some kind you have no pressure and thus no 'thicc' reactor vessel. These can be constructed incredibly quickly.
If you actually put a challenge with a fix amount of money to produce 100GWh of 100% clean highly reliable electricity setting up a assembly line of reactor production and develop traveling build teams that set up site. Then show up with a huge truck and dump the reactor into the site.
Doing that with renewables is an unsolved problem unless maybe in countries where you have a massive amount of hydro.
Thank the gods, Canada has finally changed its regulations (and the US is slowly doing so too) so actual real progress has been made on commercial molten salt (and other) reactors. Terrestrial Energy, Moltex Energy and a number of other companies are deeply engaged in the process of getting these reactors threw licensing now. These reactors are often more 10x smaller for the same output of energy and thus far cheaper to build.