For me, the EX has 25 more amps. I have used the LX series units for years, went to the EX as I work for the company and was taken care of on it. The LX will do all the EX will for me, aluminum included. The LX is a great unit and sometime easier to get than the EX as there are so machine videos on the EX people this they have to have an EX.

Like I mentioned, I used the LX for many years. Not one complaint. I have a used one, can see what is left on the warranty. Well broke in too. Middleburg?