I think they're both excellent. I have voted Clyne simply because he is a FB, who can play left or right and be superb on either side. Chambers just happens to be able to play at RB, like Jack Cork, for example, but he's a super player who can fill in at various positions down the right side of central, in midfield or defence. I'd like to see Calum groomed to play in other positions for the team. Yes, that'll be difficult because he'd be pushing others out, but he can always play in those positions when there are injuries to others. He's much more versatile than just being a Right Back.
And neither would disgrace an England shirt right now.
And neither would disgrace an England shirt right now.