Llanberis up, Rangers and Telegraph Valley down.
As said, Llanberis Path is busy as it’s the easiest path up and down, Rangers Path is not so busy and there are quite a few tricky/push sections along it (unless you are the Athertons maybe!), Telegraph Valley is now suitable for gravel bikes.
It is a nice one to get ticked off on a nice sunny day, but will involve either a very early morning, or late evening.
However I agree with stevedoc, hiking the snowdon horseshoe is a better experience than riding Snowdon.