B250 vs B250M vs B250H

Solution
B250 is the chipset. The M suffix refers to the Micro ATX form factor. The H is just one of Asus's ROG branding series for the B250, the other being B250G. The G is a Micro ATX motherboard, while the H is an ATX motherboard.
B250 is the chipset. The M suffix refers to the Micro ATX form factor. The H is just one of Asus's ROG branding series for the B250, the other being B250G. The G is a Micro ATX motherboard, while the H is an ATX motherboard.
 
Solution