a 2x12 has different tonal characteristics than a 1x12. Technically, it is not louder, but it is pushing more air, thus it may feel louder.
Quote by gilmourish
which one would you "recommend"???

It's all down to preference. The 2x12 is bassier, but also heavier and probably more expensive.
If you can go 2x12, I'd go with 2x12, as mentioned, more bass response and better projection. 1x12s tend to sound boxy when played at high volumes.