Driver Easy and Driver Booster are excellent. I've used both of them, on literally tens of computers. They both have a large database of drivers and do a very good job of finding the right drivers. The free version of Driver Easy is very limited, which is not an issue if you're using the Pro version.
DriverHub is a free driver updater, which also automatically installs drivers and works well. However, if you're using Driver Easy and Driver Booster, there's probably not much point in using it.
In terms of having the largest database of drivers, DriverAssist is far better than Driver Easy and Driver Booster, but it is expensive and doesn't correctly match the right drivers as well as they do. Having a very large database of drivers come in handy for me, as I am regularly doing clean installs of Windows on different computers. The larger the database of drivers, the more likely the driver update software is able to find drivers for any devices that Windows has not been able to find drivers for.
In your case, you may as well just stick with Driver Easy and Driver Booster. Just bear in mind that while driver updates can include important bug fixes and in some cases will increase system performance, if your system is running fine, it's definitely not essential to keep the drivers updated.