Peter, I think I answered you in another thread somewhere, but figured I'd go on record here as well...especially since my answers will vary greatly from some of the others on this thread...
Everyone has different criteria, different priorities, different values...You need to do what's right for you...But, here are MY preferences and reasons:
<<Celebrity, Princess or HAL?<<
I've never cruised HAL...I'm 49 and have a great fear of ships full of octagenarians...nothing against octagenarians, I hope to be one someday...But, I did a Baltic cruise on Princess two years ago and the average age of the passengers had to be well over 80...The whole ship seemed to be closed down with everyone in bed by 10 each night...not for me...
I would choose Celebrity (and I have...I'm doing Alaska on the Summit July 3 for a 13 night cruisetour)...Why? Because I prefer Celebrity...I think they do a great job all the way around...better service, more class...My one cruise with Princess was a major disappointment (the ship and service, not the ports and itinerary)...Now, Princess has a great reputation for its Alaska cruisetours, but that doesn't close the sale with me...
>>One-way to Alaska or roundtrip?<<
No question in my mind--ONE WAY...Yes, it's cheaper on airfare to do a round trip...but, seriously, you're flying a very long way...which is more important-- Saving a few dollars or deeing as much as you can? As long as you're coming this far, do it right...Doing a one-way allows you to extend your trip with a cruisetour to the INTERIOR of Alaska...
>> Southbound or northbound?<<
Either works, but my preference is Southbound...that way, you can do the hard stuff first, THEN relax on the ship...Of course, for you, if your following up with land time in BC, Washington and Oregon, Southbound is even better still...that way, you can break up the two land sections with the cruise in the middle...Go for a tour of Alaska--Denali/Fairbanks, etc., then board the ship...then off the ship for further travels in the Pacific Northwest...
>>Embarkation for a roundtrip: Seattle or Vancouver?<<
Again, wouldn't be my choice...I don't see much difference between the two except that the Seattle RT has to do a stop in Canada , usually Victoria, to avoid the Jones Act...If you're spending time post cruise in Vancouver, you can easily get to Victoria on your own anyway...
>>Inside or stateroom/w balcony?<<
Balconies are nice...But, fo me, I've opted for a Cat 4 Window...booked 7002 on the Summit--on the FRONT of the ship...When we're in port, none of it matters...I'm not on the boat anyway, let alone out on my balcony...When we're at night, I'm in the dining room, showroom, lounges...When we're at sea, cruising Fjords or whatever, I'm probably just heading up on deck (remember half of those balconies might be on the "wrong" sid eof the ship for whatever you want to see)...Besides, I enjoy the social aspects of cruising...
But, again, everyone has their own preferences and desires...