We have cruised Regent many times, and SS once on the Cloud. It was Stockholm to London last fall, and it was a special. It was discounted so that it was less expensive than a comparable Regent cruise -- comparing private balcony rooms with private balcony rooms. On the Cloud, we liked the small size of the ship, the entertainment, and the absolute lack of vibration or any other ride problems. On Regent, we prefer the larger suite size in lower categories, the food and the excursion offerings -- which were clearly lacking on SS.

I would not call SS "stuffy" and there were plenty of guests our age (50s and 60s) and younger. But SS does not offer many (if any) cruises without formal nights. If you want to fit in on SS, this means a tux for men. On a Regent formal night, I've always had plenty of company wearing a dark suit. And, Regent offers more cruises with no formal nights. The service on SS is also more formal, and Regent's is more "chummy" But this is only a matter of style rather than substance, and the substance of the service seems about equally good on both lines.