Depends. Normal hunting ranges I would take the 7mm-08 all day long. Out west on really flat ground with +400 yard shots I would probably go with the .270. 
Just my .02
Just my .02
.68 is not 7mm, it is .270. The 7mm is larger then .270. The 6.5 is smaller then .270. Where does 7.03 come from???? I don't have a 7mm-08, but it is a fine cartridge. I prefer 7mm rem Mag and 6.5x55. .270 is redundant to what I have, and does not add any advantage. What have you been smokin'?I wonder? I would go with the .270 WCF for Western hunting. The larger 30-06 engine compared to the smaller .308 engine gives the old .270 an important edge.
And if you are turned on by metrics the .270 is after all a 7.03-06. caliber rifle.