Generally a moose float hunt doesn't involve nearly as much exertion as a backpack hunt like mountain goats or sheep here in Alaska, of course packing a moose through a swamp and alders a mile plus back to the raft will quickly change that

. That coupled with the fact that you aren't really carrying camp on your back where every oz counts would lead me to say if you wanted to save your money and get some HH impertech its a great option. I still use mine for hunts where I'm not hiking/backpacking everywhere and have camp on my back. But the Koldo and Yukon is likely what I would choose. I used the Chugach for 2 years of solid use and the jacket held up well, but the pants lasted about one season each (roughly 100 days in the field) and would have to be replaced at the end of the year. Granted the average user wouldn't be wearing them that much, obviously.
But if I were you and of the options listed I wouldn't be too concerned about weight and if you aren't concerned about spending the coin the Kuiu Yukon stuff is super tough for sure, as is the Koldo at however I believe the Yukon would likely breath better and the price reflects that, and no doubt the HH impertech will keep you dry but not much breathing at all. But for a float hunt here in Alaska I don't feel as though rain gear breath-ability is nearly as important as a mountain
bacpacking hunt. Clear as mud?
If you plan on doing backpacking mountain hunts in the future in wet environments then for sure save yourself some money in the long run and get the Yukon first if money is no option or the Koldo if you are looking to save a bit of money and still want breathable and tough, but a better price point. Just what I'd do in your given situation.