>>11276042both are considerations for such absurdly far future that it doesn't even make sense to consider it. It may even be that we find better ways to exploit laws of physics for energy, and the idea of a dyson sphere will seem quaint, the weird retrofuturism of the primitive 21st century.
But I think fusion energy is far more likely to be developed first, for the sole reason that a dyson sphere is such a massive undertaking that it would take hundreds of years to even collect the required resources, effectively depleting most of the solar system.