Hi Lawrence,

I assume you mean the Tiguan Allspace, as the regular Tiguan has only five seats. Both the Allspace and Touran have similar levels of room inside, though I'd favour the Touran in terms of running costs. The Tiguan Allspace has a little more boot space when all seats are in use, though. Really you need to go check both cars out for yourself. 

Having lived with a Touran myself (three kids), I'd suggest that both of these cars could be a little small for a family of seven and you'd be better served by a full-sized people carrier such as the Volkswagen Sharan or SEAT Alhambra.