if you want a DMR gun, the M14 is your best bet. Its gearbox is of a sounder design.
If you want a M14, get TM. If you want a G3, get CA. Simple as that. Between the two, in terms of performance, the M14 is superior.
M14 will run you $700-$800 for a stock brand new one. Worth it? Definitely! Stock, you will outrange most stock AEGs and will have superior accuracy to them as well. Upgraded, the sky is the limit, with near Bolt Action performance potential.
Personally, i would get the M14.