A lot of times, there might be more than one Wi-Fi network in a given location. Sometimes one wireless router is broadcasting multiple channels on a guest/private basis, and other times there are simply more than one wireless network. In any case, you likely have a personal preference in terms of which one you like to connect to.
For anyone in this kind of predicament, a new free jailbreak tweak called PreferMyFi 2 by DillanCodez can be very useful in ensuring you’re always connected to your network of preference whenever possible.