What are the pros and cons of each??

on a certain website, polyurethane lips are a little bit more expensive.

Can someone shed some light for me?

 

ABS is a rigid plastic it will only flex so far before it cracks. Polyurethane is a flexible plastic it will flex much more than a rigid plastic before it breaks, you can bend it in half and it won't crack. As far as painting there are some adhesion promoter products for both plastics and some specifically for rigid and specifically for flexible.

 

ABS is only good till first curb, polyurethane can and will withstand some serious abuse, I'd sped few extra bucks and get urethane