What does your wife do? Does she work? Study? Self sufficient? She will need to exercise treaty rights in the UK for you to be able to enjoy from the EEA regulations. See more
here.
If she is exercising treaty rights, you have an
automatic right to live and work in the UK. After 5 years of living in the UK under the EEA regulations you obtain Permanent Residence status (the EEA version of ILR) and after 1 year you can apply for British citizenship.
All EEA application are free of charge.
In your case, time for PR started when you entered the UK as a married person (assuming your wife is exercising treaty rights). Time in the UK before marriage might be recognised by the HO (their discretion).
To summarise, if you want to save money, go via the EEA regulations route. If you want to save time, stick to the ILR route.