We did a one-way to Alaska July, 2002. The only reason we went to Anchorage was because my husbands cousin lives there and we wanted to see him.
Unless you can do a land tour as well, next time I would go round trip because it cost us 710.00 per person (4 of us) to fly from Anchorage to Alberta. This was an extra 2800.00 just to fly home.
It was our choice to do it this way, most of what we seen could have been done round trip, although, Prince William Sound was beautiful. We have never seen glaciers before so we had nothing to compare it too.
Hope this helps.