Out of the 3, VFC is the highest end. A lot of experienced techs will build their own guns out of VFCs for a number of reasons.
G&Ps are good guns, but they have some downsides. They pretty much NEED to be shimmed straight out of the box or they could suffer catastrophic failure prematurely. Both guns make for fine upgrade platforms.
The TAR is.... special. Would not advise getting unless you already have a good, reliable daily driver primary rifle.
I change primaries like other people change socks.