The suite benefits are nice. We are only 2 in a cabin, so although space is nice, it doesn't carry as much weight for us. When we are making the decision, we tend to ask ourselves:
1. What is our total budget for this cruise? How are we willing to break-out the expenses? If we put more toward cabin, are we willing to spend less on other expenses, such as air fare to the cruise port, before/after stays, excursions, etc.?
2. Where is the new cabin located? If we have gone to the trouble to pick a veranda cabin in a good location, we wouldn't move to a signature suite in a location which we might not like. In that case, the perks of a suite might lose their luster.
So, for us it comes down to money, and as the old real estate adage goes, "location, location, location".
And no matter what your decision is, you will have a great trip. It sure is fun to be planning a trip!