There are so many different variants of self storage facilities out there and which kind of self storage unit is going to be best for you is going to depend greatly on individual factors such as what you want to store in your self storage unit and how long you want to store it for.
For example, if you are storing a bunch of nick knacks and stuff for a short period of time, it might not be so important that you spend the extra money on a nicer self storage unit. Unless you find something that is really dirty and run down, your things should be ok for a short period of time in a more basic self storage unit. If on the other hand, you have things like furniture, electronics or any sort of belonging that is rich in sentimental (or just normal I guess) value, or if you are considering using your storage unit for a longer period of time, it is probably worth the few extra dollars every month for you to rent a self storage unit that is climate controlled and extra secure against the elements. These are usually the self storage units that are more indoor than outdoor and usually have multiple levels of protection against the battering outside of wind, rain and other elements. Since the self storage facility is temperature controlled, your wood furniture will never swell and expand with the extreme heat or humidity and your electronics will not freeze over during the cold months.
This is only one of the many factors that goes into finding a really good self storage unit facility to fit your needs. Because self storage facilities have become such a popular business during the last decade or so, a number of different self storage facilities have popped up covering pretty much every possible variation of self storage unit that you can possibly imagine. Because of this, it is really not so difficult for you to be able to find a self storage unit facility that fits well within the boundaries of what it is that you are looking for and is within your area.
If you want to really find the best possible self storage unit facility for your needs, the best thing to do is to write out what you want out of your self storage unit and what exactly you want to use if for. Are you going to keep valuable things in your self storage unit? Are you going to invest in shelves and plastic bins or are your things going to be in cardboard boxes sitting on the floor? Are you planning on only keeping your self storage unit for a few months while you move or complete some sort of project or is this going to be a more long term thing? Once you figure out exactly what it is that you need, finding something that will match all of your needs should be fairly easy.