I work as an ML on Snowdon and my preferred route would be to park in Llanberis and get the bus to PyP, walk up the pyg and the down the Llanberis path.
The other, over looked, route I like is the Rhyd Ddu path.
Get in touch if you want any specific advice or even if you fancy hiring me to give you an educational day on the mountain rather than ‘just’ a walk! :D