BTP Kelvar/Aramid Cage vs. Carbon Cage

[userdeleted]

Alright I have a question bout btp's ( www.b-t-p.de for those of you that dont already know about it) aramid (kelvar) 4.5 gram bottle cage vs their carbon 9 gram bottle cage. Is there a difference in strength or 'sideways flex' between the two, or is it just that you pay more for the lighter one and they are the same otherwise? Has anyone tried both?
Thanks in advance

[Franzam]

lokke here:
http://weightweenies.starbike.com/forum/viewtopic.php?t=931