'Fatten up' Guitar Track

Hello all.
 
I am using SONAR Producer 6.  I recorded a guitar track with my Peavey 6505 112 60W 1X12 Tube AMP going into my M-Audio Fast Track Ultra USB 2.0 AI Line In.  The sound was rich and thick when I was playing.  However, when I listened to the recording in SONAR, it sounded 'rubbery'.  So two questions:
 

1. Is it better to record guitar amp tracks with a microphone or line in?
2. Any suggestions on how to 'fatten up' the track I already recorded?

Thank you
 
 

Huge topic! You need to experiment with every possible combination until you get the sound your want. Every amp/guitar/efx box/mike /speaker cab etc is totally different, there is no magic solution that works every time. One thing I do is put my extention speaker in another room and then either using headphones or the monitors I can hear what is going to tape ( whoops, well you no what I mean)
There are DI boxes that sound amazing and there are overpriced pedal boards that will suck the tone out of the best axe.
If your amp sound great then thats a good start. It will take experimenting with the mike to capture it. The line out often bypasses the second tube stage and the speakers which play a critical roll in the sound. I have a line out on my custom made Fender Princeton that is a tap of the speaker output so it's real close,  I often use the mike but it's hard to be in the same room while tracking. Some people build a isolation box if they don't have the luxury of a extra room.

I don't really go for turd polishing a track that sound badly recorded, I just do it again.

That fat guitar whoops, I mean Uke, sound....