Tracker - GPS vs VHF for stolen vehicle recovery

[MrDodo]

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?

[bmcecosse]

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.

[Dean]

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.

[MrDodo]

Thanks Dean for your thoughts.