I just ran accros this on the merlin forums and thought I would share. This is a basic vid telling differences between router firmwares.
5 Reasons why I prefer ASUSWRT-Merlin to ASUSWRT Firmware [RT-AC68U] - YouTube
Cool stuff…got a kick out of him pronouncing firmware. 
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Im pretty sure troy was going to expand on this more as well.
Good frimware.