when looking into a motherboard, what decides what you pick is:
1. CPU socket, depending on what cpu you have decided
then the follow up questions are
2. How many gpus are you planning to use. if its one, then you can automatically aim for the lower cost boards like above.
3. Ram frequency compatability
4. smaller, but # of 3 pins for system fans depending on case
5. minor, how many normal pci slots/usb/sata ports you need