I really like Keira Knightley and how she acted that role so if I had to pick one I'd choose the 2005' version, altough of course (like any movie inspired by a book) is not just the same as the real P&P.
I like both the 1995 and 2005 versions for different reasons. I love Colin Firth, so there's reason enough to love it, but it is VERY long... The 2005 version was beautifully shot, and nicely paced.