The fastest 386 was the 486SX. ;)

Interestingly, the 487SX was a complete 486DX that disabled the original 486SX.

https://micro.magnet.fsu.edu/optics/olympusmicd/galleries/ch...

EDIT: IBM's LC chips were targeted at laptops initially but then found their way into embedded systems. Cyrex (used in the BL line) was often slightly ahead in performance and performance/price, but compatibility wasn't always there.