If you primarily work on the laptop monitor then the 15" might be more pleasant. I have the 13" and its all good for me. But I also have dual 23" screens when

If you primarily work on the laptop monitor then the 15" might be more pleasant. I have the 13" and its all good for me. But I also have dual 23" screens when I need to, so its all good. I also go mobile a lot so having the lighter weight and smaller size to me is great. As for performance, 95% of the time I don't care that I have the i5, and the other 5% of the time I remember to get up and do something other than stare at a computer.