If you've been casually following the various Raspberry Pi releases like myself, it's likely you have little to no idea what other mini ARM boards there are on the market.
Thankfully Phoronix has published a quick wrap-up and some benchmarks of competing boards compared to the well-known Raspberry Pi 3. Coming in hot and topping the list was the ODROID-C2, labeled as costing "just a few dollars more ($40 USD) while having a faster SoC and other advantages."
The claimed advantages of this product include a 64-bit quad-core SBC, backed by the Amlogic S905 which comes in at 2GHz with four Cortex-154 cores, paired with 2GB of DDR3 SDRAM and a Mali 450 GPU. Connection options include Gigabit Ethernet, HDMI 2.0 and full support for Android and Ubuntu, all wrapped up in a $40 asking price.
Listed at $5 more than the aforementioned Raspberry Pi 3, this product provides a higher clocked CPU, more RAM, greater storage and more. Further insight into this comparison can be found here.