With a distant seller, the question of payment is really a question of trust - will the thing arrive, and will it be what was described. With a shop two kilometres away that has been on Sadar Bazar since 1961, that framing does not apply.
What is left is a practical difference, and it is a real one.
Short answer: For a local same-day order, cash on delivery and online payment are equally safe. The real difference is that paying on delivery lets you check the weight and the goods before the money moves.

The one difference that matters
Dry fruit and spices are sold by weight, and weight is the thing customers most reasonably want to verify. Paying at the door means you can open the packet, look at it, and weigh it if you want, before any money moves.
That is not a statement about dishonesty. It is that a half-kilo order of cashew is a meaningful amount of money and people like to see it before they pay for it, and there is nothing unreasonable about that.
Paying online reverses the order - the money moves first and any correction happens afterwards. The correction is straightforward with a local shop, but it is an extra conversation rather than a non-event.

Where online genuinely wins
Not needing exact change. A 437-rupee order paid in cash involves a conversation about change at the door. UPI does not.
Ordering for somebody else. Sending dry fruit to a relative's house, paying for a delivery while you are at work, arranging a wedding order from another city - all of these are much simpler paid online.
A record without the paper. The payment history is on your phone whether or not you kept the bill.
Large orders. Nobody enjoys carrying eight thousand rupees in cash to the door, on either side.

What we do either way
Every order is weighed and billed with the weight on it, whichever way it is paid. If the weight is short, we make it up - that does not depend on how you paid.
If something is not what you expected, the answer is the same: send a message, and we replace it or refund it. For a shop in the same town as its customers, that is not a policy so much as the only way to still be here in sixty years.
Delivery inside Salumbar is free over two hundred rupees, same day for orders before five, and both payment methods are available on every order.
The honest recommendation
For a first order, or any order where the weight matters to you, pay on delivery and check it. That is what the option is for.
Once you have a sense of how the shop weighs, online is simply more convenient, and it is what most regular customers end up using - not because it is safer but because nobody wants to find change twice a week.
Both are fine. Anybody telling you one is risky for a local order from a shop you can walk to is overcomplicating it.

Buying it in Salumbar
Our dry fruits is on this site with the weight and the price on every pack. Order before 5 PM and it reaches you the same day inside Salumbar, free over ₹200. We have been on Sadar Bazar since 1961. If you would rather just say what you want, send it on WhatsApp and we will confirm the price before we pack anything.
Questions people ask
Is cash on delivery available in Salumbar?
Yes, on every order, with no extra charge.
Is paying online safe for a local order?
Yes. The payment goes through a standard payment gateway, and for a shop in the same town the trust question that makes COD attractive with distant sellers does not really apply.
Can I check the weight before paying?
Yes - that is the main practical advantage of paying at the door. Every order is billed with the weight on it either way.
What if the order is wrong?
Send a message. We replace it or refund it, and that does not depend on how you paid.
Is there a minimum order for delivery?
Delivery inside Salumbar is free over ₹200. Below that it still goes out, with a small charge.
Can I pay for an order being delivered to someone else?
Yes, and online is much easier for that. Give the recipient's address and pay from wherever you are.