It's a difficult question to answer, as different derbies are intense for different reasons.
In terms of quality, the old firm game is dross. In terms of it being an exciting game, its also dross. In terms of trouble between the fans, there's really not much of it on matchday. A couple of arrests here and there but there's never any fighting etc. Old firm games have been shite for nearly 10 years now. I think the media build it up to be bigger than it is, hence people get strange opinions of the fixture.
In terms of quality the ayrshire Derby and the Edinburgh Derby aren't good either. But what you get, well in ayrshirr anyway, is trouble breaking out all over the place, streets were lined with bricks the last time the two clubs met and kilmarnock was a bit of a warzone that night.
Swansea cardiff appears a bigger version of the above, where there's fans causing trouble inside and outside the ground but the match itself isn't up to much.
I don't know what order to put the fixtures in, but the following have to be included.
City v Rags
Swansea v Cardiff
West Ham v Milwall
Burnley v Blackburn
Birmingham v Villa
In Scotland...
Hibs v Hearts
Celtic v Rangers
Kilmarnock v Ayr<br /><br />-- Sat Aug 27, 2011 5:48 pm --<br /><br />Infact there's more trouble at Auchinleck Talbot v Cumnock matches than any other fixture in Scotland.
I bet not many of you will have heard of either club, never mind have any knowledge of the rivalry. Not a dig btw, just pointing out that you don't always have to look at the big fixtures, rangers Celtic etc for intense rivalries.