Correction: further research indicates Tsu Li is indeed the once famous 莱阳梨 from Laiyang region of Shandong province (Lai Yang Chi Li). But I am not sure if Tsu Li is one kind of Su Li (酥梨).
I have Shin Li but it’s still young. The Shin Li I bought in Asian grocery store didn’t impress me much. Theoretically Shin Li should taste better/sweeter than Tsu Li.