Both are good cars and are very similar. This is going to come down to your personal preference.
Advantages to the 3 include - Better resale, better reliability and slightly better fuel economy if you opt for the 2.0 Liter engine.
Advantages to the Lancer include - better warranty
We chose the 3 because we felt that it was more comfortable, you get more car for the money and it gets better fuel economy.
Plus, although the MIVEC engine in the Lancer is very reliable, I find it way too loud.