Which oil do you use for cooking?

[Sudden]

As title really. I've always used extra virgin olive oil for cooking most things and sunflower oil for deep frying. This is mainly because I had been told that olive oil is one of the healthier oils for cooking and pretty much anything will do if you're deep frying.

Lately however, i've been told by a couple of friends (who generally know what they're talking about in this area), that olive oil is not a good one to use for cooking because it tends to decompose quite quickly, making it unhealthy. Led me to wonder then, what do most people use for cooking and if you use what you use for health reasons or for taste reasons?

 

[Sudden]

Groundnut/regular olive oil seem to be the winners mostly (you know, apart from the cooking in lard idea though if I was going that route i'd probably stick to the tried and tested desi ghee ). AcidHell - extra virgin and regular olive oil are the exact same prices (at least in Sainsbury's. Brand I get is Filippo), so presumably that's not the only reason to go for the regular?

I should have probably mentioned - I mostly cook Indian food, so most of that is light frying in a pan, if that makes a difference?

HeadlessChicken - i've heard that rapespeed oil, while pretty healthy, tastes really bad and takes a while to get used to as its flavour really comes through what you're cooking. Is that the case with it?