Ok here is the deal:
You get a M.I G. Welder, {the 135} you begin to repair things, fenders and the like.
Then all of a sudden you think to yourself geeze i`m pretty good at welding {you will be after a little practice and trial and error}.
Then you think to yourself Hmmmmmmmmm I could make this and that {Anything from a BBQ to a rotisserie for rotating car bodys.}
But there will be occasions where you will be welding 3/8 Steel. The 135 would be fine for the BBQ {Even if you made it {god forbid} out of 3/8 plate.
Then there is the question of the rotisserie {it`s going to hold your PRESSIOUS car body while you work on it.} Besides there is a lot of welding to manufacture a large item. This is where the duty cycle comes in to play. With the 230 V machine you can run longer welds {weld continus for long periods of time} with no harm to your home wireing or the welding machine. You can also SAFELY weld thicker materials. One other factor is ..... a 230 V anything is cheaper to operate {electrical consumption} than 110 V is.
It ALL boils down to BUDGET and desire, {personal choice}
I say IF budget allows, get the 230 V machine you`ll never regret it.
You have to condiser that consumables will cost you some unforseen $ Initialy a sizeable amount, {the gas bottle}
{cart} {Hose and regullator{May be included} {Spools of different types and diameters of wire.} {Extra contact tips
Believe me when i say, just learning you will neeed a few of these}
All in All, MY CHOICE would be the 230 V 175 A machine.
The 110 V 135 A machine will do you a fine job also the only things to consider here are the limitations and budget.