Rafael is a wing back, in my view. Neville has always been a solid full back, but never really "that" good in the way his year was (Butt, Scholes, Giggs, Beckham etc). I'd pick Brown ahead of him every day of the week. he's quick, reads the game well, he's strong, can tackle, cross, commanding in the air... cracking full back (considering he's actually a CB) for United and they've missed him hugely this season.