“even if aliens have been visiting Earth, what would make a wormhole more likely the way than bending space (warp)?”
Actually, a wormhole would be much less likely, because, as I have been saying, it would be impossible to use a wormhole for FTL travel.
Neutralizing inertia is the way to do it. Take the equation F = ma and take “m” to near zero. Speed limit is no longer a factor. Use the zero point field existing everywhere and you have your fuel source anywhere you are traveling.