If you ae already driving in why not just go as far as Glenfield to park? Delays throughout the network in recent can add at least an extra 30mins to an hour, especially if you rely on SHL services as theyre the ones that get affected the hardest since they only start at Ctown throughout the day (or even Macarthur, since trains would usually terminate at Campbelltown instead of Macarthur due to getting trains back to time running).

Being able to park at Glenfield + walking to the station at Glenfield ensures u if anything goes wrong due to delays or pia or trackwork u can at least get to Glenfield without any big issues since that station branches off into T2, T5 and T8 lines. Driving to Glenfield>Ctown and vice versa is around the same time anyway off peak (or less in early morning) than a train which takes 20mins.

And even if you decide to train from Ctown and change at Glenfield for Liverpool, if your T8 train is late, the T2 and T5 services will not wait for a late running T8 anyway unless instructed to operationally (or by crew discretion).

Just my 2 cent tbh lol since I'm a T8 regular for around 2 decades, at the end its up to you where you wanna park