Shinagawa Shinkansen platform to Keikyu Shinagawa platform transfer

We'll be arriving from Osaka via Shinkansen to Shinagawa. Since the place we'll be staying at is along the Keisei Oshiage line, we'll be taking the Keikyu-Asakusa-Keisei through service.

Our Shinkansen tickets will be QR tickets, but we already have IC cards for everything else.

I want to know if there's anything I need to take note of while going through Shinagawa. I noticed that there is a Keikyu Transfer exit, but I've read a post in the past that it's better to just exit the JR side and re-enter the Keikyu side of Shinagawa.

by Moonting41