RGB LEDs vs Red/Green LEDS

As a play project, I'm thinking about building a traffic light emulation circuit. If I already have RGB LEDs, Is there any benefit to buying RG (red/green) LEDS, vs. just ignoring the blue lead? I assume I can still create yellow by activating both red/green on the RG LEDs.

Yes, you can still get yellow. If you already have the RGB I don't know any reason to not use them.

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The red and green dies may be further apart in an RGB LED. That may mean not as good colour mixing as with a red/green LED, depending on the packages.

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That's a really good point.

The modern RGB LEDs tend to be MUCH brighter than the older red/green bipolar LEDs.

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