I've had both Lincoln and Miller, both work well, are durable, and easy to service and supply. My comments would mirror Dave's; the Miller has a slightly better "feel", user friendliness..........though the Lincoln is not objectionable........it's just a slight preference thing.

You might want to wait to pull the trigger til next week when you're at SEMA. Both companies usually have large displays and will likely have promotional sales going, they have in the past. You might be able t swing an even better deal there.