The best replacement for mig welding is tig welding.

The best alternatives to mig welding are rated as following:
★★★★★  tig welding
★★★  arc welding
★★★  stick
★★★  tig
★★★  flux core
★★  brazing
★★  arc
★★  stick welding
★  gas welding
★  wire feed
★  flux core welding
★  flux welding
★  mag welding
  spot welding
  wire welding
  flux
  resistance spot welding

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Speaking about mig welding, one probably shouldn't forget about argon.

Other search terms related to mig welding and their ratings are:
★★★★★ argon
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mig welding
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