Using which would be more accurate? Bond enthalpies or standard enthalpies of formation?

Question

Comparing the enthalpies of reaction calculated from bond enthalpies and from standard enthalpies of formation, which would be more accurate?

Answer 1

You're absolutely right about it.

I would add that the same kinds of bonds have different energies in different molecules, so using bond energies is indeed an approximation.

Answer 2

Enthalpies of formation should be more accurate.