Both boards have only one PCI-E slot. The Biostar has onboard graphics and uses DDR2, the Gigabyte 770T does not have onboard graphics and uses DDR3.
There will be no difference in speed between the two options, except in programs and games that use 4 cores. In those cases, the 940 will be better.
If you get the 720+770T, you will also need DDR3 RAM, which will cost about $10 more.