IMO, without knowing those mills I think you need to know your volume of grain, will you be conditioning the malt, will you be using grains of varied sizes that require you to reset the gap frequently?
I use a Barley Crusher and have started malt conditioning. I can pretty much leave the gap set and have a great crush with 2 rollers. If I was going to be doing massive amounts of brewing for the next 20 years I would buy a 3 roller, Stainless Steel built like a tank mill. Otherwise I would just go for the less expensive model and be ok with it.