She's also the most down-to-earth. (No pun intended given she's an earth pony.) Applejack is a hard-working, honest, matter-of-fact and boy-howdy friendly cowgirl. And she looks really cool with that hat.
To be honest the Size comparison is still a hotly debated subject. My judgement came from twilight looking in the mirror at her pony self as well as the and in the Portal turning to a hoof. Also most ponies I have seen are normally between 4-5ft tall. So you can see how hard it is to get a accurate size.
: Ah like yer band, sugarcube! You just go boy-howdy plumb wild on that bass! : Thanks, Applejack. Didja see us on Equestria's Got Talent last week? : Yer darn tootin' ah did! The Rainbooms got all four yes votes... even from ol' Fancy Pants! : Ah cain't stand that uppity so-and-so. But ah like his funny mustache. : He's alright... once ya get past his big words and high confalootin', he's okay.