Morris Minor Owners Club

Given the worrying increase in classic car theft I'm considering having a tracking device fitted to my car. I know that there are relatively cheap GPS devices available online, but given "you get what you pay for" I'm thinking about spending (quite a bit) more and going for a monitored service.
Does anyone have any sound technical knowledge of the pros/cons of the GPS- vs VHF -based system used by the eponymous tracking company?

With either - if the car is locked up in a steel container - the signal won't get out anyway. Just apply the usual anti-theft measures, and lock it up out of sight in a garage at your house - and it is very unlikely to go missing.

Fit whatever floats your boat.

The tracker thingy does work as my dad had first hand experience of one working. Just under twenty years ago I think.

The car was traced and followed a lot sooner than the police actually admitted to my dad.

My dad thinking the car was lost forever, completely unawares that the police were actually lying in wait for a team of car strippers to appear at a lock up to strip his car.

The villans appeared, were jumped on, arrested, sent to prison for quite a while as part of a larger cartel.

Dads car got returned.. unscathed.. happy days.

Thanks Dean for your thoughts.