Eh, but as far as I can remember PCB was pretty easy (I'm only a normal player though, and PCB was the first title I cleared in hard) and to me SA easily replaced EoSD as the hardest Touhou when it came out, and then UFO.
Speaking of which, seeing this thread reminds me I still haven't 1cc'd TD. It's been years since I last played this though so I guess it will remain that way for some time.