Every restaurant owner shopping for software hits this question, usually after a demo where both products looked similar. They are not.
A POS takes money
A point of sale does one job well: capture an order, apply pricing and offers, take payment, print a receipt, and record the transaction. A good retail POS does that fast, offline, and with proper cash controls.
If you run a takeaway counter with a fixed menu and no table service, a retail POS with a food menu is genuinely enough.
A restaurant management system runs a service
The moment you have tables, a kitchen with stations, delivery riders, or more than one sales channel, the order is only the beginning. What you now need:
Table and course management. Which table, which seat, which course, which server. Split bills, merged bills, transferred tables. A retail POS has no concept of any of this.
Kitchen routing. The grill items go to the grill screen, the cold items to the cold station, and the whole ticket has to land together at the pass. Colour-coded by age so the expeditor can see what is late.
Channel consolidation. Dine-in, your own online orders and aggregator orders all need to arrive in one queue. The alternative — a tablet per aggregator — is where most missed orders come from.
Recipe-level inventory. A retail POS deducts "one burger" from stock. A restaurant system deducts 140g of beef, one bun, 20g of cheese and 15ml of sauce, which is the only way to see food cost honestly.
Delivery dispatch. Rider assignment, batching, live tracking, zone pricing, proof of delivery.
The test
Ask one question: can it tell me my food cost percentage per item, per outlet, per day?
A POS cannot, because it does not know what is in the dish. That single capability is what separates the two categories, and it is usually worth more than everything else combined — most restaurants discover 5 to 9 percentage points of food cost improvement in the first quarter, simply because portioning drift becomes visible.
What it costs to get this wrong
Buying a retail POS for a table-service restaurant does not fail loudly. It fails as an accumulation: manual kitchen chits, a tablet per aggregator, food cost calculated monthly from purchase invoices, and an inventory count that nobody trusts. Every one of those is survivable, which is exactly why it persists for years.
Start small, but start in the right category
You do not need every module on day one. POS and kitchen display first, then online ordering, then delivery and loyalty. But start with a platform that has the rest available, because migrating a live restaurant twice is genuinely painful.