Yeah, I played with an Onion Omega for a while. The downside to it is the horribly limiting 16MB flash (with 64MB RAM, WTF?). When I first read it, I thought it was 16GB and a typo. (We have 128GB micro-SD cards already, and all they could put was 16MB onto it?)

That's where the Pi excels since it has a micro-SD slot (and a much faster CPU of course). But then, no Wi-Fi ...