When it comes to mig welding vs tig welding, tig welding is more of a slow process and therefore it could take time to finish a large project. So time and speed are what make TIG welding its weak points. As such, the filler deposition rate is also much lower although the weld penetration is much deeper. 
It is much harder to learn than MIG welding because TIG welding is specially designed to deal with thinner and softer metals and therefore the machines itself require experienced welders to set its parameters properly.
Argon and helium which are both inert gases are both expensive gases so these add up to the initial cost required for TIG welding. 
If MIG welding is hotter than TIG welding, TIG welding is brighter which can expose your eyes to high-intensity light without the necessary precautions.
So these are what you can get from mig and tig welding so it’s up to you which could fit your kind of work and what your work or hobby requires.
Troubleshooting MIG and TIG Welding
TIG and MIG welders, because both use current to produce arc to heat elements are also prone to failures, problems and damages. But in every problem, obviously, there is a cause and here we will discuss the common problems that mig and tig welding usually experience. We will also discuss some of the best solutions to give you a head start whenever you encounter these issues.