Hi DORUblk,
There are several differences between the boards and they are generally designed for different applications.
The National Instruments MyRIO is designed to be used with LabVIEW, C, and VHDL. You can download software applications to its processor or synthesize your code into HDL and target its on-board FPGA. The MyRIO is designed to be used with peripherals that connect via analog and digital I/O but can also connect via other protocols such as USB and WiFi.
The Digilent z7-20 also has an on-board processor and on-board FPGA. The z7-20 can be used with LabVIEW but does not have the breadth of LabVIEW support that the MyRIO does. The z7-20 also has more variety of I/O (including HDMI).
Both devices are compatible with Digilent's PMOD devices.
It is difficult to compare them with "Pros vs Cons" because this will be highly application dependent (Necessary number of I/O, voltage levels, environmental concerns, price, etc.).
Both are great tools for learning about embedded controls, processors, and FPGAs.
Regards,
Ramsey
National Instruments
