The question is like asking 'What's the best car in the world?' Before answering, you have to ask, 'For what purpose?' Same with beer. On a baking hot summer's day, if I'm lathered in sweat after digging over the garden, my choice of beer might be very different from what I'd chose after coming home frozen in the middle of winter after attending an outdoor sporting fixture. There's no single answer. Horses for courses, I say.
There are some great micro brewery beers being produced. Just had some Welham Poacher from the Langton brewery in Leicestershire - superb - http://www.langtonbre...y/index.php/our-ales/
Also worth a look to see a huge range of superb beers from round the world have a look at: http://www.the-offie.co.uk/