I mean, whatever works for you. I tried using the motions, and the two problems I had were the increments between movements, and occasionally miscounting, either of which can result in a two putt or in my ball falling into a black hole on an Oakmont green. The meter seems more precise. I know exactly what % I am hitting. As long as I read the elevations and breaks right, I am usually 1-2.5' past the hole if I miss.
But as with anything, if you find a method that works for you and you are comfortable with, and you practice it enough to get good at it, it doesn't matter the means, only the destination. Look at Rick Barry (hope that doesn't date me too much).
As far as putters go, I preferred the Spider to the Anser. Then I was going to use the Spider until I could get the Rossa (still need 4 levels). But I decided to rent the Redwood at 47ish, and liked it enough to buy as a bridge to the Rossa. I prefer the slower metered clubs. I plan to play a 50% meter driver and wood, but you can miss by a little witha driver or wood and usually be alright. With a putter, you miss. The Rossa has the same meter as the Raptures, and I'll probably always use those irons and the Rossa, even as I upgrade my Driver and Woods for more length.