IUI vs IVF

Me and my husband are 29. Both of us don't smoke or drink. Weight is also not an issue. We follow a healthy lifestyle. We have been ttc for about a year. On the six month mark, my ob GYN suggested my hubby to get a sperm analysis. His results are:

Morphology: 1

Vol: 3.5 ml

Sperm concentration: 28.1 M/ml

Percent Motile: 16

Concentration motile: 4.4

He has started taking health supplements and both of us are watching our diets. Is it too soon to go to a fertility clinic? Should we wait more and try for natural conception? What do you think will be applicable to us IUI vs IVF?