I usually record both. DI and amplified on 2 channels, and split the signal and monitor FX on another set of channels which gets recorded too, because a lot of time my guitarists may feed off the FX they're hearing, and it influences how they play, and it may be hard to replicate with FX in post, so I have those tracks to work with too. Sometimes I drop the Pre FX in favor of Post, it all depends on the song, and the tone we're trying to achieve. The only thing I don't record is the reverb (Except the amplifier's reverb). Reverb can always be dialed back in at the end of the day.