I own a openrd platform, which isn't perhaps quite as up to date as the CuBox chipset, and it too has many of the features you mention.
But it is not a fast system. Gigabit ethernet? Sure, but good luck getting anywhere near that speed. Similar for the e-Sata port. Oh, sure, I can get a 60 mbps samba share up on the thing, but that caps out it's cpu.
The specifications for what it supports does not indicate what kind of performance it will have. The quad core Samsung processor will almost certainly dominate the Marvell unit's performance. Or maybe not: I don't have one. I've just been underwhelmed by what throughput Marvell has delivered me.