I agree Art. It is matter of individual preference and also matter of personal experience as well. The wauke 'format' if you will...is made up of a number of defensive and offensive 'natural body mechanics' taken to a highly sophisticated level of action/reaction performance.
These components can be put to use singly or together depending on preference, types of incoming force, and kinds of incoming attacks...with a view to an end result _intent
_ of any application.
You wrote once that the 'fighters' of the vicious tournament days and of some unfortunate real life situations...tended to use the wauke moves with two hands.
I agree because when we fought we came up against some extremely powerful and big opponents throwing techniques/kicks they were practicing against trees, like the great TSD fighters of Bobby Cheezic we fought in the Boston area.
I know you remember the 'wars' with Bob's students...strongest fighters I ever recall. http://usamartialartsct.com/CheezicTangSooDo.htm
As you know, there will be attacks out in the world that will penetrate any type of blocking defense, so it is best to ingrain the use of two arms as major elements of a defensive shield to the body.
The beauty of the wauke 'format' is in the million and one _ways_ it can be put to use by practitioners, defensively and offensively.
Here is an old thread with great comments by Bill Glasheen and Dana Sheets...viewtopic.php?p=166478
Some elements for discussion
Alan Dollar's book refers to both " Hirate Mawashi Uke" and "Wauke".
His distinction is that the first uses only one arm, the second uses both arms (adds the secondary block).
The words above all contain elements of wauke. Hirate mawashi uke to be specific. Flat hand circle block is a literal translation of a japanese name for a chinese principle of body movement.
Mr. Nakamatsu has shown us a way to use the same motion to cut across the incoming force at a 30-45 degree angle.
I use and train them all because I use and train the one. The shape of the circular movement is decided by how you're transforming the incoming force.
Do I want to turn uke in place or do I want to drill up uke's arm into their face? Do I come crashing down on uke's arm like a ton of bricks with my weight or do I seal his elbow into his ribs? Do I bust uke's balance by slamming across uke's neck or do I let uke enter and pass by only to be seized and tossed as I use two parts of his body as pivot points?
The circle is a principle not a pattern.
It can be an oval, a sphere, or even have some part that is straight, it can look like the letter "O", the letter "D", the letter "J", the number "0", the letter "S", or even a "C". At what point in the circle are you driving up from the ground? At what point are you dropping your weight into the circle? How fast is the attack coming, how slowly, are you ahead of it or behind it? All these things will decide the shape.
If you try to use one shape to answer every force you will fail most of the time, though even a broken clock is correct twice a day. In my way of thinking at this time, if you use the principle of the circle then you will use the right kind of circle with the right kind of force to achieve an outcome that puts you at an advantage.