Single-board computers run a full OS. The ecosystem — Raspberry Pi for GPIO and HATs, Jetson for CUDA edge AI, LattePanda for x86 Windows or Linux — matters more than the headline benchmark.
Full Linux or Windows on a board: Raspberry Pi 5 (8GB) to Zero 2 W, a wide range of Jetson Nano and Orin kits for CUDA vision work, x86 LattePandas — plus the coolers, antennas, and NVMe adapters keyed to each board generation.