I wouldn’t trust a ghost with a barge pole. Ghost is just an immobiliser. Pandora, depending on what you get is a fully customisable system. I can do so much with it, control it from my phone, my watch, also remote start. Further more mine is set that if the tag is not there, the car isn’t opening or starting.
Cost is dependent on what you get. I wanted certain things enabled, disabled and added to mine so I wouldn’t use my price as a benchmark. You are best contacting a Pandora dealer and discuss your needs.