The eight Samsung F-strip build is the same amount of diodes in two of the QB 288 boards and uses the same diode as was used in the V1 Quantum boards, Samsung's LM561C. The QB 288 V2 Quantum boards use the new Samsung LM301B diode which is a little bit more efficient - about 5% or so. The QB324 OTOH, used a Nichia diode (don't recall exactly which one) which was supposed to be a little more efficient than the QB288/304 V1 boards.
For a 4x2, the Samsung strip build is a perfect fit, and while the QB setups are a little bit more electrically efficient, they really don't fit a 4x2, you would need two of them to fill that space properly. So really its a matter of whether you want to spend twice as much money to get 10% more photons per watt.