I would go for the RG everytime.
I think that the necks may have been slightly thicker on the kramer and charvel.
THe real reason for recommending the RG is the trem. Basically as long sa it is Jap made, and carries a true edge
All the others would have a lesser FR type. The only trem I would choose over the edge trems (not trs) would be a real Schaller. If any have a real schaller then the RG may not be the best.
I cannot stress this enough. Beware of those cheaper jackson/charvel trems. Some of them are as bad as the TRS.
Hope that's useful.