If you spend 1 year in work permit it will help with your PR as you can come under Canadian Experience Class.
Once you receive PR, 50% of your time spent in work permit will count as valid stay in Canada and will help in applying for citizenship.
The only caveat being that if you will be able to apply for new H1B, get PERM , port I140 priority date, get I485 all under the same role in which you had initially obtained your first I-140.