Head over to the BC forum and ask this question, or better yet, do a search on the BC forum, then stand back when your computer spits out thousands of multi-page threads on this exact topic. If you read them all, you'll be old and gray, and so sick of hearing about any sort of BC that you'll likely never dive again! Usually the threads start off with an innocent question like yours, progress through passionate defenses of each, then degenerate into name calling and pointless arguments.
That said, I dive with a BP/W and I love it, I can't imagine going back to a standard jacket BC. BTW, there's really nothing new to learn in diving with one. The biggest difference is the "trim" or attitude in the water you are likely to assume through moving the weight from your hips to your back. (steel plate only) That should take you about 2-3 minutes in a pool to get used to.