I wouldn't be against Jack. How much do you think he will command though? Don't you think he might get an $8 Million offer? I think the Spurs would want to keep any offer at 3 years for any of these guys.
I think we'll have to just see what the market dictates. Both guys would seem that they would be able to run the point. Signing either would mean the end of Gary Neal - but honestly - I wouldn't cry over losing him.
It will also come down to the individual player. Coming to the Spurs system means you have to at least attempt to play defense. They both aren't great, but I think Jack is a little better in this regard.