I'm local and I'd say that although Canterbury West Station is closer to the uni, it's easier to make/find the bus connection if you can travel to Canterbury East Station. From Canterbury East I'd imagine you get directed to the bus station, but I'm pretty sure the university bus stops on the ring road outside a used cars sales garage, which is en route and less than half way between the bus and railway stations. Also, if you travel all the way to the bus station, you need to use an under pass to cross the ring road, which is a pain.