iui clomid vs injectables

K
I got my 2nd <a href="https://glowing.com/glow-fertility-program">iui</a> today while taking clomid. My doctor suggested using injectables if we do another <a href="https://glowing.com/glow-fertility-program">iui</a>. 
Anyone have succes w injectables - were they painful?? 
Thoughts on which is better.