If your business has more than one location and you're still paying a carrier for an MPLS circuit, there's a good chance you're spending more than you need to. But "just switch to SD-WAN" is lazy advice. Here's the honest version.
MPLS is a private, carrier-managed network that links your sites together. Its big selling point is predictability: low latency, low jitter, and a service-level guarantee. Its big downsides are cost and rigidity — circuits are expensive, take weeks to provision, and you're locked to one carrier.
SD-WAN doesn't replace your internet connections — it sits on top of them. It lets you bond multiple cheap links (broadband, fibre, even 4G/5G) and intelligently routes each type of traffic over the best path in real time. Your video call takes the low-latency link; a backup job takes the cheap one.
The practical wins:
Multiple sites, growing cloud and SaaS usage, video-heavy workflows, or simply an MPLS bill that's gone up year after year. If any of those sound familiar, SD-WAN almost always comes out ahead on cost and flexibility.
If you run a single site, the question is moot — you don't need either. And if you have a hard regulatory or latency requirement that demands a guaranteed private path, MPLS (or a hybrid of both) may still earn its keep. The right answer depends on your actual traffic, not a trend.
SD-WAN is only as good as the configuration behind it. A poorly set-up deployment can leave security gaps or route traffic badly — undoing the benefits. This is engineering work, not a box you plug in. Done right, it pays for itself; done carelessly, it's a new set of problems.