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Actually, we're heavier than M31...still...but not as large linearly. M31's estimated mass is still 1.23 trillion solar masses, if I remember correctly. So, if our new mass is 3 trillion, M31 is less than half our weight. It's like comparing Betelgeuse and eta Carina. Betelgeuse is 2.5 times the size of eta, but only 0.2 times as massive. We're smaller, but denser than M31. We also produce more stars per year than M31....3-4 solar mass/year c.f. 1 solar mass/year.
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