We did both in a similar time frame this year with a weekend in Seattle in the middle. We loved both, but for us Quantum had a slight edge. We went to Icy Strait Point and having the extra port day definitely was a bonus. Next time, we would definitely love to visit Sitka.
Having a proper port day at Victoria on Ovation was nice. We took the public bus to Butchard Gardens, which was amazing and still had time to do a little sightseeing in Victoria.
Corinna