I knew you would ask this. So I will explain it, like to a child.
If you knew I was going to ask this, you should have pre-emptively explained it, like a good teacher would.
The difference is in distance and time. Hold a racket in each hand. Stretch out our arms. There's a racket on the right. And there is a racket on the left, it is already there. It does not have to travel there. And I don't have to turn my body and take 1 step to reach the exact position.
OK. That makes sense. How it actually translates to point play I'm not so sure. Reach matters more the further away the ball is. But the further away the ball is, the more time I have to get there which means I'll have time to turn and extend my racquet. The initial advantage will probably be lost in the noise: maybe you'll get a slight advantage?
So if you're 100% ambidextrous and can hit both FHs equally well, that's the ideal situation. But if I lost to you, the biggest difference would probably be my UEs, not your slightly longer/quicker reach.
Stand with your back against the wall. Interlace your fingers. How far can you reach left and right. Compared that to when 2 hands are apart.
You're still talking about reach. Articulation is being able to manipulate something like a racquet. I don't see how you playing with 2 racquets can articulate one of those racquets better than you playing with the 2-handled racquet. The only possible difference I can see is perhaps the heavier weight of a 2-handled racquet or the slightly different racquet face angle relative to the handle. You could argue that one or both affects articulation but I can't see it being a major factor.
So yes, there are differences. Not enough to justify taking up 2 racquets and alienating other MeetUp groups but that's your business.