Based on your choices;
Sigma Select C or Sigma Select S is the Favourite for you.
Sigma Select is the Favourite for you.
Sigma Select C
If you have to stay put
Choose a Sigma Select compact if you intend to be stationary, stay in a welding booth or be right next to the working table at all times.
Sigma Select S
When you need to move around
Choose a Sigma Select with separate wire feeder if you need to be able to move around welding large workpieces, e.g. inside containers or narrow passages.