Originally Posted by hwcopela
Only a bench capper can seal the threaded bottles.
This. You need a heavy duty (read: "expensive") capper to properly seal twist-offs.
Also, and this might just be a rumor so feel free to call me an idiot, but I have heard that the twist-off bottles, since they are being filled and sealed with already carbed beer in the factory, aren't as strong as the pop-tops and cannot always stand the pressures of bottle conditioning. At least, I've never seen a professional, bottle conditioned beer in a twist-off.