There's a reason why there's a thread that talks about beginner cubes. There's also a reason many people don't start beginners on the best cube available.
Sheng'en FII all they way for beginner cubes. I start most people on those just because they're cheaper than storeboughts (barring shipping), the quality of the cube makes it a bargain for the price, and even though it locks up sometimes, it's still good enough for the purposes of the beginner. Plus, you don't know if that beginner is going to drop cubing altogether at some point and decide never to pick it up again, and that would make buying such an awesome cube, like a Dayan, a waste of money. Let the beginner decide whether or not they want a really good professional-level cube or whatnot after they've had a good taste of speedcubing to decide whether or not they like the activity, but start them off with something relatively small, like the FII, just to keep them from gathering distaste for speedcubing from using an often-impossible-to-turn storebought cube. We want to add invite more people into the cubing community, but we don't want to hamper their development either by giving them something too fast. That's why the FII and other cubes of similar stature make a nice compromise that fits both needs very well.
EDIT: Now, if you were going to start a beginner on ONE of the best cubes available, I'd go with an unmodded Dayan Lunhui with torpedoes. I have two of them, one with torpedoes and one without, but both cubes seem to be ridiculously sturdy and extremely forgiving, perfect for a beginner.
And if you already know that the person is actually going to be getting into speedcubing and not dropping it for a long time, then sure, why not? Go buy them the best cube available. Just make sure it's very sturdy and very forgiving.