Hi,
here are my 2 cents about how to find "good" sticks.
How can you tell if the rattan is good?
You can hear it. Hard rattan that lasts gives a dry hard sound. Difficult to describe when you sit and try to type a sound into a keyboard. But once you have heared it, you can pick "good" rattan from "bad" rattan.
A funny thing happened to me with Ernesto presas in 1986. A student gave me a stick and said, that he wanted one that matches the one. Thert was a bag with 100 stick in front of me. I tried so many, clicking and weighing them. Finally I gave him one and said: I would choose this one.
He looked at it and wasn´t sure. He put it bag into the bag and asked Ernesto to pick one. He also went through many stick and gave the guy a stick - it was exactly the one I picked too. I thought that was cool.
But coming back to the question:
what is good and what is bad?
Rattan that lasts is more dense and is heavier. Sure good for Sinawali. Lighter rattan, that is not so dense will easily disolve in sinawali, but may be good for twirling or when you want to practice with slight contact.
For beginners that have not yet trained wrists, I would suggest lighter sticks and only a little later heavier ones.
If you want to train your forearms and endurance, of course heavy sticks will be your choice.
But how about th vibrations? Especially impoportant for styles, that do a lot of sinawalis and bloocking techniques. Not so relevant for the styles that go straight for the arms or stay out of range.
If you have a very heavy stick, it is very dense. There is hardly any space between the fibers of the rattan. That means, that the vibration, that occur during a block or a technique, where sticks meet, will go straight into the wrist and the ellbow. Even more so with hardwood or synthetic sticks. Sure they will not break. But I´d rather let the sticks break, than letting this energy, that breaks the sticks, flow into my body all the time without being shock absorbed in some kind. And thats where the rattan comes into play. Rattan is flexible and can absorb part of this energy and these vibations. What happens is, that the little space between the rattan fibres are being crushed and that way the rattan absorbs the energy of a strike. The harder and heavier the sticks sare, the less space between the fibers and the less ability to absorb the energy.
If you ask me from health aspect, I would prefer sticks, that protect my body. I am sure when you practice for decades only with hardwood and do a lot of Sinawalis, it is not good for your joints. I do also prefere a little harder and heavier sticks too, but not too heavy though. The real power of a strike is gererated through the speed and not throught the weight of the stick anyway, even though that helps too. But then again, my wrists are trained and I pick the sticks that feel good for me.
But for different purposes there are different sticks, at least in training. In the reality it does not matter, what you have in your hands.
But the last and most important things for training sticks is, that you must like them how they feel. If you always think that they are "too heavy" "too thick" "too small" "too light" "too long" or "too short", you should change your sticks. You must be at ease with them, then they are ok.
One instructor of mine, Rene Tongson told me, that in the 50ies, they were not training with rattan sticks but with sugarcane. And at the end to the training, they ate up their sticks.
(What a great business idea!

New sticks for every training! I would like to be the supplier then!)
Anyway, I hope that helped a little
Best regards from Germany
Datu Dieter Knüttel
http://www.abanico.de
http://www.modern-arnis.de