Tettey has the best long pass accuracy in the Championship according to Opta - Johnson has one of the worst (for a player who isn't a defender or goalkeeper - who are often rushed into long passes as clearances).
Tettey is a much better 'sitter' that Johnson in pretty much every aspect IMO, he can pass better, tackle better and is better positionally.
I'm interested to know the criteria for those stats. Much as I have been a quite vocal critic of Johnson, I do feel his passing has improved markedly over the summer. If the difference between a 'short pass' and a 'long pass' is simply a cut-off point in distance (say, 30m or whatever),I feel the stats will work in favour of Tettey and against Johnson.
My main criticism of BJ has been that he continually attempts passes beyond his technical ability, aiming for a small target a long way away, often taking the aerial route. Tettey, however, will shuttle the ball sideways or backwards to an open man, and rarely attempts passes with a high level of risk. He will drop in alongside (or even behind) the centre backs on occasion, and spray the ball sideways to full-backs, which I imagine would be a 'long pass' but not a particularly risky one, with quite a wide margin for error.
Johnson's accuracy with his long passing seems to have improved greatly over the summer – the trouble is, every time he over- or under-hits a long pass and concedes possession it gets noticed because of his history of doing it. He still tries a few too many speculative balls, and still misplaces a few too many also – he'll never be a Xabi Alonso-style playmaker, but as his accuracy has improved I feel he's been worth his place in the team. I'd still like to see Howson and Tettey together, though – I think we should be placing less emphasis on getting the ball out wide quickly with long switch passes, and more on intricate one-touch build-up through the middle (particularly while Wes is being persisted with as a nominal 'wide' play who will drift inside at any opportunity).
Can't believe I just posted a long diatribe in defence of Bradley Johnson, but there you go – say what you see, innit...