Ok so thought I would share a comparison of my S. Conq/Chief crew on the sandbox versus live server, in the Chief with same equipment on both. This is just one potential setup, which of course can be tweaked, maybe others can share your comparisons too, overall it seems Crew 2.0 can give better skill results than the current system.
First the crew skills sandbox then live:
Next firepower, again sandbox first, then live, as you see overall better on the sandbox:
Next survivability, sandbox, then live, definitely more stuff here on the sandbox, especially the consumable cooldown is great:
and finally the rest, mobility, concealment and spotting, sandbox first, then live, again better skills on the sandbox on everything other than traverse speed: