|Flexing is great for street skating on rough surfaces. Metal makes your legs shatter. Sorry, I prefer plastic for street skates. They are also less reactive which is good for me. I dont like my lower legs vibrating constantly. Now I have a set with tracker trucks for streets and I dont like the ride as much.
: : Unless you are very heavy, plastic trucks work better on streets then metal. Metal rattles.
: I've never had metal rattle...ever. Keep your bushings in good condition, and replace them when needed, and you'll never have a problem. Plastic will warp and flex much faster than metal. But, for light skating, plastic will be the better 'light weight' choice!
: It all depends on what type of skating that you'll be doing. Most of the time it will not make a difference on the plates unless you are a speed skater.