flex play question

[wowowow]

Standard scoring 10 team league start 1qb 2rb 2wr 1flex 1te 1k 1tm ... Championship Game... Torn on my flex play and curious on thoughts of Rg3 vsCam Typically start a RB as my flex but a bit concerned about Mccoy

Cam Newton or RG3 Qb BENCH T.Y Hilton,Bryce Brown,Bernard Pierce,Greg Jennings,Dallas Clark
Ray Rice RB
Alfred Morris RB
Vincent Jackson WR
Cecil Shorts WR
Lesean Mccoy or Danny Ammendola Flex
J.Finley TE
Bailey K
Green Bay TM