Ok, going to majorly sit on the fence here by saying I like both P&P films (although neither can beat the book itself) and I like both Austen & Dickens
but
for different reasons...
To me Jennifer Ehle in the BBC one was more 'Lizzie' sth to do with the cleavage (in my warped mind Lizzie is not flat chested) and the twinkle in her eye. Mr Darcy will also be forever in my mind connected with Colin Firth (sorry Janeite )& I think Lydia was perfect also
But the KK one had a far better portrayal of the relationship between Lizzie and her parents, a more realistically beautiful Jane, a suitably tempting Wickham and was produced beautifully, IMO
I don't think Dickens and Austen have much in common apart from they were both 19th century writers. She concentrates on the social niceties/romance of the Upper/Middle classes, he covers everything from children in the gutter to the aristocracy. I love her for the beautiful detail & subtle language, him for his humour and strident characterisation.
But, back to the OP, read it, read it, read it! It's a perfect book, enjoy