I have both an ODROID XU4 and a C2. The XU4 draws a lot of power under load (15-20 W) and has a noisy fan. The C2 is 64bit and fast and only draws a few watts. Of the six different SBCs I own, I think the C2 is the best in my opinion. Also the C2 is 4K. The XU4 is not.