I would go to the Hobart board,and ask Dan what he thought of his MM175.He loves his MM 210,and the 251 he has used.He pretty much buys blue every time,and has been less then thrilled with his MM 175.It has wire feed tracking,and it causes him problems.The Lincoln SP 175 Plus does not have that setup,and is much easier to dial in.The Lincolns have been made a lot longer,and weld better.I bet you will see a new improved version of the mm 175 pretty soon.The Lincolns arc is just bothered less by less than perfect welding conditions.Head to your local muffer shop,and look around what machines are in use,and ask some questions.Be sure to weld with both if you can.Notice the arc starts on both.