Retail billing and trade billing are not the same job
A retail counter sells finished goods by the piece, usually for cash, usually at a fixed rate, and speed at the till is what matters. A material shop sells by weight and volume at a rate that changed this morning, with half the turnover on credit and a substantial part of it leaving on a truck. Software optimised for the first is excellent at scanning and receipts, and has to be bent into shape for units, ageing and delivery proof.
What credit does to the requirement
In retail, credit is an exception. In the material trade it is the business — a contractor takes cement and steel through the month and settles after the site pays him. That changes what the software has to do: credit limits that warn at billing time, ageing rather than a running balance, payments allocated to specific invoices, monthly statements, and a portal the party can check themselves. These are not billing features, they are recovery features, and they decide whether a shop makes money.
Proof of delivery, which retail never needs
A retail customer walks out with the goods. A material customer sends a truck to a site he may not visit, and eight months later disputes that anything arrived. The document that settles that is a challan carrying the date, the vehicle number, the destination and the name of whoever signed for it — held against the party permanently, resendable years later. One contested load in this trade is routinely several lakh, which is why the record matters more than any counter feature.
Test it on your own week
Both products can be tried without commitment. Bill on each for a week using your real items, your real parties and your real rates. Watch the ordinary sale first, then the awkward ones: a mixed-unit bill, a credit sale to a contractor, and a load going out with a vehicle number on it. Those three tell you more than any table, and they are exactly where a general retail product and a trade product diverge.