Same store. Same tags. Different place to run them.

Every version sends the same data to the same vendors. Only where the tags run changes.

A
Client-side only Every tag runs in the browser
B
Realistic mix Server-side, plus a few browser tags
C
Server-side only One Google tag; a server does the rest
Why server-side tagging → Measured results → Run it yourself →

Demo store, fake tag IDs.