Which free-standing training bag is better (pics included)?

I

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New member
http://www.amazon.com/Title-Boxing-Century-Wavemaster-II/dp/B00362FETQ/ref=sr_1_31?s=sporting-goods&ie=UTF8&qid=1292744289&sr=1-31

or

http://www.amazon.com/Amber-Freestanding-Kick-Stand/dp/B0012UESC8/ref=sr_1_238?s=sporting-goods&ie=UTF8&qid=1292746495&sr=1-238

and dont judge by the price, because they are just offers that a random stranger is selling it for, not retail.

i am mainly confused on which material is better to train with.
i am a martial artist.
 
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