I assume you are talking about a difference of a couple hundred dollars. We stayed in a Cat. AF for a couple days on our first cruise before we got upgraded when someone left. Real nice room. It is a little bigger than a Cat BC. The decor was beautiful. I think it's worth it. This is a real nice ship. I've been on it twice and I'll do it again. There is a website called cruisestateroom.com that has pictures of most of these rooms. Check it out. Enjoy your trip.
Depends on how many extra bucks.
If ther are more then 2 in the cabin it is for sure. Better storage, bigger sofa bed, curtain to separtate the two sleeping areas, much bigger closet, nicer bath (tub/Shower).
For just two it is a coin toss. You don't get full suite service ( expanded room service). I have stayed in BA cabins 3 times. I would have again on my next cruise in Feb. but they sold out early (May). I am in an AF this time and I upgraded from an H GTD deck 4 to the AF for $500 total - Worth the extra bucks!