Except for the Bridgestones I 've had them all. Like you I ride 95% on tarmac with an occasional blast over unpaved tracks: that's what I like about the bike; get dirty whenever you feel for it.
Currently on TKC's and just ordered a new rear after 6000km's, but that's only becouse the front is still good. If I had to replace them both, I'd go for the Enduro's again.
Compared to the TKC's the Metzeler Enduro offer more grip on tarmac and slightly less off-road. More important (to me), the Endurances are stable and neutral while cornering, unlike the TKC's.
Me about Enduro's:
http://www.xt660.com/showpost.php?p=92903&postcount=8
Me about TKC's:
http://www.xt660.com/showpost.php?p=113774&postcount=19
HJ