I am new to welding - been at it about a year now.
Started off with stick inverter, then bought a TIG torch and bottle of Argon to go with it.
I found I wasted too much gas having to control it manually with a knob on top of the torch, and lift TIG was a pain.
Then I upgraded to a DC TIG.
I love it. It is a very clean process. Minimal if any cleaning afterwards. No sparks so I can do it in the garage. The metal has to be very clean. No welding rusty panels for MOT.
I haven't got a foot control. I have been told it is not necessary if only welding steel.

TIG allows a great range of control I have welded everything from 7mm plate and 3mm box section, to the tips of Stanley knife blades together.

I still have a lot to learn. I am fairly successful at sticking the metal together and getting pretty (and I hope strong) welds. My biggest problem is metal distortion. Maintaining the accuracy would be my biggest concern if I was to tackle a frame for a CNC.