Service Endpoint vs Private Endpoint

On Storage Account: Allow access from selected subnets in Azure vNet (For Free)

On Azure vNet Subnet: Apply Service Endpoint Policy (For Free)

vs

Connecting from premise.

Private Endpoint per hour / Inbound per GB / Outbound per GB

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Service Endpoints can only be connected from Azure vNet.

Private Endpoints on the other hand can be connected from premise.

Service Endpoints

There's no additional charge for using service endpoints.
https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-service-endpoints-overview#pricing-and-limits

There is no additional charge for using service endpoint policies.
https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-service-endpoint-policies-overview#pricing-and-limits

Private Endpoint

https://docs.microsoft.com/zh-tw/azure/private-link/private-endpoint-overview

Private Link (Private Endpoint) Pricing
https://azure.microsoft.com/en-us/pricing/details/private-link/