Thanks for the replies (although I didn't mean using the same technique for different attack types - I was referring to more subtle aspects of ukes position).
The way many people respond to fighting situations (inc. myself) is pretty instinctive. If people really believe that every technique is equal in all attacks, why do we bother learning more than one technique (in some ways I think this is maybe why Ueshibas 'Budo' is quite concise without lists of lots of techniques).
When I first started aikido I had my favourite techniques (e.g. shiho-nage) whereas now this isn't so much the case - however during randori I will do specific techniques depending on the position of uke etc. Is this not the case with everyone else?