Should I use Wi Fi vs 3G when able

I just got my Iphone, and if I am in range of wifi (like in my house) it asks if I want to connect. Should I? Is it faster/better?

I've made an assumption, obviously a big one.
In my country, (the UK), we pay one price for the phone and then as an ongoing contract, we pay for a service that includes a certain amount of text messages and voice minutes. In addition to this, free WiFi-from BT Openzone or a network called The Cloud is also bundled in.
At home for my broadband I pay one monthly cost that means I have a connection of X megabytes in speed with unlimited data downloads.
Those points the reasoning behind my statement. I just assumed you had something similar.

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