@73max Just for the record, I've nothing to gain if you buy a Mac with an autoformer in it :)
However, you if you can find a set of ZEROs (which, so far as I know, are the only outboard autoformers available for this task), I think its a very good idea to give them a shot if you feel like it.
One thing George is ignoring here is that in a Mac, the autoformers are inside the feedback loop, which makes a difference on how the amp behaves. As others have suggested, audition is the arbitrator.
However, you if you can find a set of ZEROs (which, so far as I know, are the only outboard autoformers available for this task), I think its a very good idea to give them a shot if you feel like it.
One thing George is ignoring here is that in a Mac, the autoformers are inside the feedback loop, which makes a difference on how the amp behaves. As others have suggested, audition is the arbitrator.