This Muse Pi Pro SBC uses a RISC-V processor and sports a PCIe port
There's a lot on this tiny board.
The Raspberry Pi is a fine SBC, but it's by no means the only one out there. There are other options available that do different things, and while there isn't a "best in class" board, they all do something the others can't, which makes it handy for picking one to fit your specific project.
