I tried them both out a few months ago, and I personally liked the Line6 much more than the BOSS.. I found ht Line6 sounded more realistic, and the boss sounded more digital, fake, almost the same feeling i attribute to a metal zone pedal... That kind of digital distortion sound it gives..
I also found the software to plug the Line6 into the computer directly with very useful, and easy to use.
it makes more sense to separate o/d boxes and amp modelling devices from effects like delay, reverb, chorus etc.
the problem with all-in-one boxes like the ones being discussed here is that, while they usually do a more than adequate job of providing effects, the overdrives, distortions and amp models almost never come anywhere close to the real thing.
If you really HAVE to do it with an all-in-one (see post regarding multi versus stompboxes), here's my quick take:
XT Live has the easiest interface. Models are good, upgradeability/flexibilty is very good, good support.
GT8 is best in terms of controllability/amount of parameters, but consequently has the steepest learning curve. Need to buy some external switches to properly control it live.
Tonelab stuff has least amount of options, but best tone IMHO.
Listen with your ears, then go buy some stompboxes.-Eric
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