To set the record straight, the Nautilus Tweeter is hardly a "gimmicky name for a regular old tweeter." This isn't some Vifa or Peerless tweeter purchased from another manufacturer and stuffed into a box. This is a proprietary tweeter designed and manufactured by B&W for B&W only. The Nautilus tweeter is described here and as you can see, there is quite a bit of technology behind it. Does is hurt the marketing side? Of course not, but then again B&W is in the business of selling speakers.

In regards to which speaker, as other's have mentioned it's a personal taste issue. Before I bought my B&W CDM 7NT's, I compared them against Studio 100's v2, Vandy 2ce's, Deftech's, M&K's, and everything else I could lay my mits on. Of all the speakers, it came down to the Studio's and B&W's. For what I listen to, I preferred the B&W's clarity and speed, especially in the bass. Using a brutal Dave Weckl track that has a quick walking bass line, the Studio's had more trouble delineating each pluck of the strings and things tended to get a bit smeared. Now keep in mind, this is the v2, and from what Woochifer says (an opinion I trust), the v3's have addressed this by toning down the tweeter (many complained of fatigue on the v2's) while tightening up the bass at the expense of some lower frequency extension and slam. Also, let me point out that to tell the difference between the Paradigm's and B&W's, you had to compare them side by side and exert a level of concentration that would be completely counterproductive to actually enjoying music. In other words, I'm not talking "night and day" differences here.

Bottom line, you should try to listen to both speakers in your own house. Differences in sound between the B&W's and Paradigms would probably come more from how each interacts with the room versus specific design differences. See if you're dealer will let you demo a pair of each to make the final decision. Ultimately, that is the safest way to determine which is best for you.

Good luck.