Yeah, that's what I would figure as well. It's not likely to make much of a difference but if my switch was on 1.0 still, I would leave it right where it is TBH.
Where did you get this figure from? That doesn't sound right to me. I'm not arguing one way or the other. That's a very complicated question (ie. "powerful" is an ambiguous term. It isn't a technical measurement) and in some ways, it's comparing apples to oranges but I have seen several side by side comparisons on games that run on multiple platforms and seeing the ps3 versions beside the Switch versions there didn't seem to be a 2-3x difference in anything to me.
If I were to guess I would say they're likely quite similar in most respects. Some architectures are better suited to certain purposes better than others, and the ps3 architecture is pretty exotic. Developers are still learning to squeeze more juice out of the PS3 and its getting awful close to its EOL (at least in Sony's view, that is). The ARM architecture is ubiquitous now and is probably the main target for most Dev's as it powers so many devices but in my understanding it's better suited to low power applications. To squeeze every possible ounce of math operations/parallel processing I would imagine your probably going to design something more like the PS3 CELL architecture than ARM if you were going to design from the ground up.
(this is just off the cuff guessing from a layman, take it with a grain of salt)
