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The Raspberry Pi B+ certainly does have SPI and I2C as well as Ethernet and GPIO pins, I have no experience with the Orange Pi.

Search for Pi 'Hats', I'm not sure why they call them that unless it's just because they sit on top of the main board, they follow a standard pin configuration so they plug directly in to the main board and are stackable so several boards can be fitted at once. Pi's also have four USB sockets, a camera interface and HDMI video outputs.

Brian.