Choosing a garden sprayer doesn't have to be confusing or difficult. All you have to do is determine your preference based on the area you have to cover.
You should also identify the problem in your garden and decide whether to use the sprayer for herbicides or pesticides. It's best to have a sprayer for each type of solution, as you shouldn't be mixing chemicals.
You'll never have to worry about your garden plants or lawn being killed by using too much of one spray or the other. With a garden sprayer, you'll be able to monitor exactly how much herbicide or pesticide is getting into your plants.