I probably have decided to go with the JG. After the research i have constructed I have learned the Following.
JG Better internals more magazines compatible/more compatible with after market parts. However the JG externals is weaker and the 2 piece barrel wiggles a little.
G&G m4a1: Better externals, some problems with magazines. Lower quality gears in the gearbox darker colored plastic also the battery is more simple to put in than compared to the JG.
So i decided to go with the JG maybe one day when i grow older ill upgrade it to a m16