Clomid vs clomid/IUI

I've had my fertility specialist tell me my next step is clomid combined with <a href="">IUI</a> but not one or the other. My normal gyn told me today I could do clomid alone for 3 months and sometimes that alone is successful. What are your experiences with these methods? We have been TTC for 2 years and every test and blood work has been normal.