2012 Yaris - mileage variants

[Yaris175]

Hi,
I'm looking to buy a Yaris in UK and have found 2 possible vehicles but would like to know which would be best;

2012, in burning red, 21k miles, fsh (3 stamps).
2012, in dacoma grey, 33k miles, fsh (3 stamps).

So basically we have exact same cars/models/spec, same price with only difference being the colour and miles. Now I slightly favour the grey colour but this has also done 12k miles more than the red one. I know I'm being pedantic but should I be going for the lower miles over the colour or given the reliability of Toyota and low miles of both, just go for the colour I want instead. I can be persuaded to go for red if the mileage factor carries more weight in terms of getting the better car.

I am not sure what type of miles (ie town or motorway) each car has done.

Any advice would be appreciated.