Tannoy has a very dedicated almost purist following while JBL is geared to the mass-market. This is not to say that you will prefer Tannoy in a 'face-to-face' comparison. It is just that Tannoy has very loyal following. Kef speakers can compete.
Also, if you go to the bluebook you will find that Tannoy keeps value better than JBL.
Also, if you go to the bluebook you will find that Tannoy keeps value better than JBL.