The average dick size is 4 inches (Not ten inches...) and the average girl only feels 4 inches, so if you're 29 inches, all you're doing is hurting her so no, the bigger does not = the better. I'm not entirely sure since no one has ever defined this but dick size is normally when non-erect. However some girls and guys measure when erect. To know how big someone gets when erect is normally the same, varying about half an inch or so. 2 inched non-erect = 3 inches erect. 3 inches non-erect = 5 inches erect. The pattern if you can't see is you take half and if you can't half that then you just round it (1.414 is half of two so rounded it's 1) Hope this explains things.
Mick: I'm 7 inches.
Joe: AHAHAHAHA I'm so much bigger than you!
Mick: On or off?
Joe: On dumbass!
Mick: Well I'm off, so go fuck yourself.
Joe: ...Shut up!
Jenna: I like Dennis since he's 5 inches in dick size and it doesn't fucking kill me inside.