Be aware that your first trip would be a total c'n'r deal and the second trip you can bring some home.
the first trip can be hit and miss, early chinook may not show up in any numbers until may some years, like last year. But you could travel around to the kitimat river to look for both wild and hatchery steelhead (not brat sized). There will be other spring run steelhead rivers to fish , some with boat only access.
On the second trip you will have a chance to fish for chinook of the very large size (Pictures in one of the tackle shops of a 107lb brood stock fish), but the water color can be in one day and out the next. Also many more fishermen this time of year.
PIcking a trip will really depend on what you are looking for, first trip less people,fewer fish c'n'r. Second trip larger fish,more people,and the chance to take a couple home.
I would do both trips if possible. One of my salesmen lives in terrace and has all the boats and equipment to fish salt and fresh and I have gone a number of times in the past.
Best trip was late july with 46 chinook in 3 days, one mid 70's (released),one 64lbs, 10 over 50lbs and only one was smaller than 30lbs.