Determine the wattage needed to run the devices you want. That will dictate the size of a unit you need. Once you have a generator running one would be prone to plugging in more than the single item that was originally planned for, keep that added load in mind when choosing the size you want. If it would be used seldom a cheap off brand may be the way to go, just practice good storage maintenance. The 2 cycle units are usually small output, capable of supplying one device. They are lightweight, easy on fuel and relatively quiet. If you are going to use it frequently or for long periods of time an investment in a name brand with a Honda motor is the way to go. I have a Multi-Quip 6500 watt I use on the job site. It runs 8-10 hours a day for, at times two to three weeks. It powers a compressor, saws, drills and a variety of other equipment. It is 15 plus years old and runs good yet. The key to that is proper storage maintenance. It will use 4-5 gallons of fuel on a long hard day. It is a two man job to load it for transport, not that one can't but you will wish you hadn't.