for me is Strike, the only REAL color separation is RX-78 and Zaku II
other than that all improved joint system but colour separation parts reduced since RG strike. 

RG strike still have impressive panel like due to old MG is not really great
then UC ms needless to say la...

till Justice came out because there was no MG Justice there haha, only got old HG...

then GP 01 series then Strike Freedom bla bla bla.... 

i still not yet touch my RG destiny since last 3-4 version thread ago 

then pray for when lightning strikes