web api with entity framework or ADO.net

We have web application developed in Asp.net 3.5 with 3 tier architecture. At that time we have used ADO.net and stored procedure. Now we planning to convert it into SPA using AngularJS and asp.net Web API. We are confused whether to go with Entity framework or ADO.net. As we are having stored procedures for CRUD operations will it be beneficial to use Entity framework or should we go ADO.net way.
Please give suggestions.