Avast Pro and Trustdefender

Using my Win8 computer for work. My employer is requiring us to use Trustdefender. It installed but would not run automatically at any time and manually would show installed but not run. Removed and reinstalled with Avast stopped and it worked. Now they are telling me that’s what I get with third rate software and I should buy Norton and not have problems. Does Avast have a better solution? I have used Avast on three machines for 5 years and don’t want to change but…