I remember Sony is the first to make IBIS. But if you check out Sony's point and shoot, all modern (after 2010?) cameras without interchangible lens are using optical stabilizer, indicating optical stabilizer is more preferred. Sony is clever. They make IBIS so that its camera can use other brand lenses.
Sony uses its new 5-axis IBIS in its two most recent ILCs, including the new top-of-the-line A9, so I doubt that Sony considers IBIS inferior for those cameras. That 5-axis IBIS innovation from Olympus and then Sony does things that are not possible with in-lens stabilization. Different trade-offs might be at work for fixed lens compacts; for one thing, the cost saving of having a single IS unit (in the body) vs needing one in each lens does not apply with fixed-lens cameras.
But of course as Farmer says, the best results will be got if both IS systems can be used in concert, as both Olympus and Panasonic are moving towards in the Micro Four Thirds system.
P. S. I doubt that any camera maker chooses an inferior stabilization technology in order to help customers buy third party lenses instead of their own ones! Lens sales provide a substantial portion of profits for ILC systems.