First of all, H61 boards are so 2012 now. A B75 board gives you much more ( usb3.0 and sata3.0 ports ) just a small increase in price.
As for B75m-dgs vs B75ma-e33 , I'd take the MSI E33 one. Quality of entry MSI boards has been increasing in recent years, while Asrock's Doggy stly... I meant DGS boards are known to have below average build quality. Plus the MSI board gets you a PCI slot.