There's a lot of sorts of soldering irons. For the majority of initiatives, you'll need a soldering station having 30 w or even more. An under-powered iron is often a terrible purchase. It finds itself costing you much more in wrecked products and damaged parts.
It will take lengthier to heat the joint, permitting heat to propagate to the part getting soldered - often times overheating and harming the component. Much longer heating times may also give more time for oxides to form around the surfaces being soldered. This prevents the solder from flowing and produce a poor joint.
Longer recovery times between joints can result in frustration, 'cold joints' or both. You don't need to spend a fortune to get a good iron. Advanced features such as temperature control and interchangeable tips are nice to have, but not essential for hobbiest-level work.