i think i have two totally different arms

[wyst]

I'm a righty, and my left arm is bigger too; both the bi and tri.

Wyst

 

[katz]

I'm right handed but my left arm is stronger.

 

[TEXgrl]

i'm a lefty and my right arm looks much better than my left. has a nicer peak and better definition. i think everyone has this, some people just notice it more because they are more critical of themselves. i'm sure your arms look great smallmovesal!