async/await vs promise as monad

thunk-async.js

import { api } from '../api';
import { regUser } from './creators';

export const loadProject = projectId => async dispatch => {
  const user = await api.loadProject(projectId);
  dispatch(
    regUser(user)
  );
};

thunk-prmise-monad.js

import { api } from '../api';
import { regUser } from './creators';

export const loadProject = projectId => dispatch => (
  api.loadProject(projectId)
    .then(regUser)
    .then(dispatch)
);