<p>I have a 13.3" Mac. It’s not too small. I use an external monitor with mine (19"; about to upgrade to 24", but I am a graduate student. I enjoy working at my desk but my monitor doesn’t “tie” me there - when I want to go to the library I just disconnect, get up and go). I love the light weight of my Mac and I carry it with me everywhere.</p>
<p>I don’t think the 1 lb difference would be significant, but personally, I prefer the smaller form factor and lighter weight of the 13.3" precisely because when I am at home, I use the large monitor.</p>