Which method are you using for map Redux dispatches to props?

Found this question somewhere on web and happens to be my question as well. Which method do you use and why?

function mapDispatchToProps(dispatch){
    return {
        onDeleteFlashMessage : bindActionCreators(deleteFlashMessage, dispatch),

        <!--  OR THIS -->

        onDeleteFlashMessage : (id) => {
            dispatch(deleteFlashMessage(id));
        }

    };
}