Gosh that would be hard! I guess the thing for me would be that with IUI I'd know that the timing would be perfect and the swimmers would be right where they needed to be, whereas with the magical natural preg it's harder to get the timing right.

BUT - you have EWCM! You have O pains!

You've been trying for 3 years, does a few more weeks make a difference? (I'm not saying that to be like ''pfft, it's only a few weeks'', it's a genuine question because sometimes those few weeks can push you over the edge and have a massive effect on mental health)

There is something a little bit magic about the natural preg that comes out of nowhere, so that would be nice, but I'm guessing the certainty of IUI would take away some of the anxiety. I guess it comes down to whether you want magic and terror, or AC and certainty (and, TBH, probably terror too).

I am no help at all.

Good luck!!