Superfeet Green - cost you £30ish, but last for years and years. Your feet, ankles, knees, and hips will be better aligned, and your body will thank you. Spend the money is my recommendation.
Soft squishy insoles are superficially comfortable, but actually don't really provide the correct support. Some people will get on with them, but most people will notice the difference (usually in their knees at the end of a day) when they change to a proper supportive insole. I have the superfeet green, but also a custom pair that cost me £125. Not too much difference in performance between the two to be honest. But a world of difference between the various cheap sorbothane and gel insoles I used to use.