Gwenn,
You have asked a question about whether the price difference "is worth it". That one is nearly impossbile to answer since what is worth it to me may be a terrible waste for you. But, for what it is worth, here is my take:
Sky Suites are about 20% larger, including a larger balcony, than either a veranda or CC stateroom. The bathrooms are twice as large as a veranda or CC room, and include a tub with a shower. Additionally, they come with perks that include butler service, nightly canapes, afternoon tea service, priority boarding, welcome aboard champagne, priority disembarkation, and all of the perks of CC class.
Most of the CC staterooms (but there are some exceptions) are the same size as the veranda cabins, but on higher decks in most cases. They are the old category 1A cabins. They come with fresh flowers and fruit, welcome aboard champagne, upgraded towells, bedding, and pillows, a set of cabin binoculars, an upgraded breakfast menu, and nightly canapes.
So, there are definite differences between what the various cabin categories include. I have sailed in all three and have had a great time in all three. Which I book depends on many factors, like what kind of deal I can get at the time.
But, whether the price difference is worht it to you or not is entirely
a personal matter. You will have a fabulous cruise no matter what you
do.
Ted