If you are typically going to be working with 1/4" and below, I would reccomend a MIG with flux core wire. The flux core wire stores well so you don't need an oven like you will with conventional welding rod. It will provide good results for the beginner right from the start without too much practice. I have shown several people how to use it dand they are always amazed at how easy it is. Far easier than stick. I would also reccomend lessons or a welding class to get your weld quality up there quicker.
I would reccomend a machine that can be expanded later. Some manufacturers sell a flux-core only machines where others such as Lincoln and Miller have entry level machines that come set up for flux core but can be upgraded with "gas' kits to make use of shielding gas to weld very thin sheet as well as Stainless and Aluminum.
I have a Lincoln Weldpack 100 with a gas kit that I have been using for many years. I bought it at Cosco. It is 110VAC powered and cost around $300 new. You can find the current version of the weldpack in most home depot stores. They also offer a 220V version. They are not very heavy to move around and do not take up much space. I keep mine in a cabinet under my workbench when not in use. I have taken mine to work several times as it was far easier to move around the ship than the onboard welding equipment. On my last ship, the DC's liked mine so much, they went and bought one for their shop as it could handle the majority of the remote repairs and new installations that they typically need to do and it didn't take them an hour to set it up for a job.
One of the best things about these small MIGs is that they will go down to fairly thin sheet metal. I have used mine to patch holes and weld in replacement panels in auto body sheet metal and it is excellent in fabricating exhaust systems. They are also great for assembly work. Hold part A against part B. Point the gun where the 2 parts meet and squeeze the trigger with a little flick of the wrist and you have a tack weld.
If I had a complaint, it would be the duty cycle limitations of the smaller machines such as the weldpack when working on larger material. I recently built a fork bucket for my loader and had to manage my assembly(weld for a bit, go cut out a new part, go back and weld for a bit) to keep up a steady work pace without exceeding the welders duty cycle and having to wait for the welder to cool down. Normal for me would be to cut, fit/assemble then weld. Doing it this way would sometimes leave me with a lot of breaktime during the welding portion waiting on the welder to cool. If you think ahead, it is not a real problem. For a machine with a higher dutycycle, you will pay substantially more money.
I may at some point get a stick welder but as yet I have not needed one. And even if I did have one, I would still grab for the MIG most of the time, even if only to do the tack welding/assembly work.