Two very distinct an different watches, albeit both awesome. I have the GO, but in green and absolutely love it, perhaps one of the tops in my collection from a pure horological perspective. It‘s a great dress watch and has one of the best case backs for any sub $15k watch.
The IWC is very cool, but at 44mm and almost 15mm thick, you have to have the wrist to pull it off, sadly, I do not. It’s movement is beautiful. My only strike is while it is Yacht in name, it has very little water resistance, so do not actually fall off the yacht. :-). To be fair, neither are meant for the water.
Ultimately, are you looking for a chunky sport watch you’ll likely wear more, or a dress watch that also looks just as good with a pair of jeans.
Panomatic just because of the size. I can't wear the Portuguese given the size.
New to this forum, I started exploring couple of years ago. I have a small collection