Should I buy a combo (plunge + fixed base) kit or a single-base router?

Across the woodworking subreddits we read, the dominant recommendation for a first router is a combo kit, because the same motor can be swapped between a fixed base (for table mounting or edge work) and a plunge base (for mortises, inlays, and stopped grooves). Single-base fixed routers make more sense as a dedicated router-table motor or as a second router.