B series mobo's are more commonly for business applications like home office usage etc, and will include things like mobo or storage software for such. H series mobo's are more commonly for Home usage, everything from grandma surfing for cooking videos to hard core gaming, and will include storage software designed for such etc. Z series are for OC applications, but generally are little more than overworked H series boards. Includes heavier traces, better power phases, better heatsinking etc needed for OC.
With a locked cpu, there's no need to pay extra for an OC capable board. Most H series boards will be almost, if not exactly, identical otherwise, same audio, same headers, same pcie, same Lan. B series is usually slightly different, being aimed at storage ability and usb/Sata usage for such, but will still have the basic necessities.
For a single user, aimed at gaming, with basic storage needs etc H boards offer better options, B are usually slightly cheaper.