In general, different payment gateways provide different costs, supports, and payment types. But it is clearly a factor to decide whether you can make a sale or not since sometimes, buyers have to cancel purchasing and look for other options from different stores, just because your store doesn’t offer their preferred payment gateway. Therefore, a payment gateway that supports all payment types is always a preferred choice.
Secondly, it is also important to consider the integration of payment gateway, the payment gateway which is easy to integrate with any eCommerce platform is the next choice.
Thirdly, customers are the ones who decide to buy your products or not so the payment gateway with great credibility and secured elements will be another good option.
It is better if you have clear in mind which is the best and most used payment gateway and which eCommerce platform offers that payment gateway.