I'm going to try VH on a Raspberry to remote control my telescope. There are a few USB devices, only one of which actually uses any serious bandwidth, but I also want to put a gigabit ethernet adapter in there to get extra speed vs the 10/100 built in ethernet. Using a USB3 to ethernet converter people are reporting around 300 mbps.
Anyway, the devices are
Auto focuser - Just serial commands for position and returning temperature once per second (9600 baud)
Scope control - another 9600 baud serial connection
Canon DSLR - commands but also a download of rather big RAW and JPG photos every few minutes. Its USB2 and I think it uses every bit of bandwidth it can.
As mentioned, the gigabit adapter.
Since the Raspberry is doing nothing other than transferring bits from USB to the ethernet adapter I'm thinking it probably doesn't need super-speed and a Raspberry 2 should suffice?
I know there's no big price advantage but everything will be run off an inverter and battery so the lower power consumption of the 2 is attractive.
What do you think? If the 2 will struggle then I'll go with a 3.