If it's any help I have a Vox AD50VT and I love it.
At the time I bought it I had a go with the line 6 and personally preferred the Vox. The salesman also stated that he thought the Vox was the better amp.
In truth I can't get a bad sound out of the Vox

All these things are pretty subjective so if you can give both a try before you commit then so much the better.