Galaxy VS Century

We sailed on the Century on our Honeymoon in December for 10 nights at it was lovely, we could have stayed much longer. For our first anniversery we are looking at a transatlantic repositioning cruise on the Galaxy from Rome to San Juan, has anyone sailed both Century and Galaxy and how do they compare? The Century was so perfect i'd hate to feel let down if the galaxy wasn't up to the same standard. It's such a shame the Century is on short cruises this year otherwise we'd have gone back.