What to you think about these names..?

soo my hubby and i are gonna try makin a baby in november(start trying in nov.) and we pretty much have the names set but we the boys name! soo which one flows/sounds better... thanks :) girl: sammantha grace boy:his: robert mack (robert is his grandpas first name mack is my great grandas first name) mine: Bradley jay jr.(my hubbys name) i like the nick name for his ;robby..but i love the name bradley i have always loved that name. and we both like sammantha(sammy) and grace is my middle name and my great grandmas first name.