Is Iui worth it?

Next month my RE said we could do iui or timed sex with letrozole and a trigger shot. My insurance covers nothing for fertility. The iui will cost about 2,000 per cycle and timed sex would be about 1,200 for monitoring and meds. Which one would you choose?

We both just turned 25 and have been trying 2 and a half years. We've done 3 failed rounds on clomid. I have stage 2 endometriosis, and only one tube. We do not have any Male factor