My favourite could well be last years Morgans, absolutely fantastic and what LM is all about for me, chocks away old chap.
My favourite big budget team is Panoz, saw big dirty don panoz at the 'poo bar about 3 years ago, and his cars always make teh best noise. & i did like the cadillacs of, '99/2000 was it??
Least favourite, sorry to say it has to be the most successful, the Audi, has that boring teutonic factor which fails to excite me, like the Ferrari F1 team of late.