The boards are about the same except the 1st one can support up to 32gb of ram where the 2nd one only 16gb ram. The biostar board is lower rated and both only support up to 1600 mhz ram and both micro atx which will limit your ability to sli or xfire if you choose that.
The Z68 is a much better chipset than the B75 by far and that Pro motherboard will beat the snot out of anything else in the price range.
Z68 has Intel RST (firmware RAID) and Smart Response (SSD caching), B75 has neither. The only advantage that the B75 has is native USB 3.0 support on that chipset. The Z68 gets its USB 3.0 support from a third party add-in chip (usually ASMedia 106x). The performance difference between the two is pretty small.
The problem with 1155 boards is that they are hard to find under $100
People who have no intention of overclocking or SLI/CFX-ing can step down to h77 or b75 which opens up quite a few reasonable options under $100. Unless the OP plans to get an SSD for SRT, the b75 becomes effectively the same as h77.
Not much point in paying extra for features the OP may have no intention of ever using.