Having grown up in Montana and lived in Alaska for almost a decade, there really is no comparison. It’s the best there is available. There are some things that are a pain, but overall it’s amazing. I’ve lived in Fairbanks, Palmer, Kenai peninsula, a few of my opinions.
Soldotna is perfect if fishing is priority, has everything you need, decent sized. There is hunting here, but a little limited as there are only a few trails for moose. Goat hunting draws are reasonable odds, sheep on the Kenai are few and far between.
Anchorage is not my favorite place, a little large for my taste. Think Billings of Alaska, crime etc common in big cities. There are a few goat opportunities, sheep is really hard to draw in the area, some fishing but fairly crowded. Moose is decent drive away mostly.
Wasilla isn’t bad, but you are a long drive from the good fishing and decent drive from hunting, so not an ideal location for either.
Fairbanks is cold and dark in winter, but you are closer to the big game hunting and not so populated as anchorage/Wasilla area. There’s not the crazy rush to Seward, Kenai, etc every weekend here, little more laid back and way less traffic. Not much for goats away from the coast, much more sheep opportunities based in the interior, moose/caribou, pike/graying fishing mainly, some salmon come through but not a lot.
I enjoyed my time in all three, not really a better place, just a better place for you. 25 years is the perfect time to go, too many show up at 48 and the young legs are long gone, limiting a lot of Alaska hunts. It’s hard to pick a favorite for me, I really enjoyed and the Kenai fishing, and hunting around Fairbanks. I would def have to choose between those two. But it depends on you fiancé, her happiness in AK will be the reason you stay or go, make sure she’s compares the good and bad.
Good luck, you will have adventures people sit around dreaming of without the cajones to get it done.