Stick is hard to learn to do well. The slag gets in the way, and you can't see what you're doing. MIG is much easier. With either, you need to get the amperage set right for the electrode. That's probably the only hard part with MIG.

Gas is much easier to weld with than a stick, and harder than a MIG. The biggest downside to the gas is that because of the lower temperature, you spread the heat out a lot. Surrounding surfaces get much hotter, but it's easy to get good penetration.