[Shop-talk] MIG Welders 115 v vs 220v

[Bob Nogueira]

My trusty hobby MIG welder gave up the ghost after 17 years. My wife bought
it for me as a present ( gotta love a women who buys you tools )  from
Harbor Freight  when they were still Harbor Salvage freight. 
It was a 115 volt model that did about 120 amps at most but served all my
needs and did everything I needed. 
Looking at HF catalog it appears they now only offer 220v MIGs. I've also
checked Northern Tool and they  still offer a 115 v MIG.  
Question : Is there an advantage to a 220 v vs a 115 v model?  I have both
220 and 115 in the shop so could go either way.  If there is no difference
the 115 v would be more convenient since I could use it in any of the
outlets as apposed to moving the work to the welder. 

Thanks for any advise . 
Bob Nogueira