Kuki, I've never been on Silversea but have been on Crystal many times in the past few years. I do not find Crystal to be stuffy!
Unlike the other luxury lines, Crystal has a very extensive enrichment program including terrrific lecturers and various classes on sea days. since you have lots of sea days on your upcoming cruise, I recommend you make the most of every day. Also, the evening entertainment on Crystal is terrific offering several production shows and headliner entertainers most evenings.
The crew really shines and provides wonderful service. Also, the word no rarely exists! The food in all the venues is terrific and if you want to special order something just give 24 hour notice.
If you have any additional questions, feel free to email me directly or post the questions here.
I sure hope you will enjoy your upcoming Crystal cruise as much as I do.