Yes, you should do Alaska! We went in 2019 after going on several Caribbean cruises. I don't even put the Alaska cruise in the same category as the Caribbean cruises. You can't compare them, they are completely different. But I love both of them. Alaska is the most beautiful place and to see it on a cruise is a good choice. As you are sailing along, you see waterfalls cascading into the ocean, the snow-capped mountains are very majestic. The beauty is unmatched.
As someone mentioned, be prepared for any weather. We were lucky (or blessed) and had amazing sunny weather for most days so we count ourselves fortunate. We did go on Princess which I do recommend. I wouldn't say we were bored to tears on Princess but there are definitely more options to keep you entertained on an RCI ship. The ability to go into Glacier Bay is worth the trade-off, in my opinion.
We are booked on Quantum in June this year going back to Alaska so it will nice to compare and contrast with our first experience.