Well..
for those who like to play styling..then go for fibre..
if those wan for standart..then PU..

I mostly go fibre cz of styling...
fibre can design watever u wan but PU...cant..

Fibre Crack,can repair even ur bumper broke in half part..
PU Broken,cant repair...

Fibre Easily Crack depends how they make..

Those Fibre BUmper from Accessories they mostly use a few FIBRE CLOTH...

Then For The Custom...Mostly whole bumper applied with FIBRE CLOTH ALL AROUND..For The Thick then Apply 2 Fibre Cloth then wont be easily crack.. ^^