Assess Your Need to Select Size
It is better to have an assessment how often you use salad spinner and how much greens you take in salad everyday. It can be that your family is big or often expects guest. So this will help you determine size of the spinner you need. You will be probably buy the bigger one.
Ease of Assembling
Another aspect that you can weigh in your choice of buying one salad spinner out of a large variety in the market is how easy is to assemble and de-assemble the spinner. If you can assemble it with a delicate ease, then you better go for it. This can save your time in the kitchen.
Easy to Use
Although function of all salad spinner is the same, they perform this function in different sort of manners. For example, some have manual handle, some have top lid and other are different in functionality altogether. So pick the one you find easy to use.
It is possible that a certain colour attracts you more than others. So the choice of colour will also matter for you to select a salad spinner for your kitchen.