Welcome to the forum, Sporran. I guess, with the alternatives you are contemplating, you have to look at the basic design theme for each vehicle: Tiguan = 'Soft-roader' so may be appropriate if you are planning numerous 'out-of-town' excursions where camping / fishing/ etc. are the order of play. While the Passat is less of an off-roader (more an urban vehicle).
Not sure if this helps ... but once again, welcome.
Cheers,
Dave
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