TL;DR It’s called the Raspberry Pi 2 Model B. Quad core ARM Cortex A7 with one Gig of RAM. It’s the same form factor as the Raspberry Pi Model B+. Available now at Newark, Element 14 ...
If you're looking at comparing the Raspberry Pi Pico to Arduino boards, though they're broadly similar, they use different programming languages and have different pinouts. Spec-wise, the Pico 2 W ...