Well, you really can't go wrong with 73°parallel geometry.

But as for "this one planes" and all the similar praise for this frame or the other one, (in my opinion) the speaker is not talking about geometry, but rather "fit," broadly defined. I mean, obviously, the seat tube and the top tube should be of a length that fits the rider's proportions; but they should also be of the suitable tube gauge.

Imagine two riders who fit the same frame size, but one weighs 150 lbs, the other 225 lbs. If the lighter rider finds a frame to "plane," the other will find it noodly; if the heavier rider finds it "planes," the other rider will find it too stiff.

Similarly, imagine two riders of the same bodily dimensions, and the same weight. They really do fit the same frame size, but one pedals at 60 rpm, the other prefers 105 rpm. These two will have different expectations of their frames; a bike that planes for one will be poorly suited to the other.

Those are extreme examples. The bike industry has found that they don't matter. Almost anyone can ride almost any bike, and this is true for you and for me. And one of us may ride a bike and have truly magical experience. Cool! But it won't be just the geometry that gives us that experience; but several factors aligning in our favor.

Good luck with that!