vinyl or steel j-bead?

If you are working with good drywall install, where you have good edges and plumb corners the plastic trim is fine, and you can put it up with adhesive quickly. It's easy to cut and it takes less fill when it comes to mudding.

However, I tend to be doing reno work, where my corners are more likely to be less than perfect and I like that you can fuss with the metal and make sure you set it plumb and square even if the drywall underneath is not. Plus outside corners in hallways and other wear areas will stand up to damage better, so for those places I prefer metal trim. So most often I end up working with metal trim, even though the durability premium has been reduced as the metal trim has gotten progressively lighter.

If it is J bead only (like edges against windows where you want a nice line for finish like a window trim), I most often will use plastic. If it is a long line against, say wood trim or ??--where I want a sharp hard line, I will use metal and be very careful if I have to use more than one length, because your eye will see any waviness and the plastic J is harder to set dead straight.

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