Q. Should cats be declawed, or should they have their claws capped?
A. Declawing is the removal of the claw and last bone of that digit, and I would definitely advise against it. Many people assume that declawing is more or less like trimming your nails or getting a manicure, but the truth is that it is a painful and permanently crippling procedure. In fact, some countries have outlawed this procedure.
Not only is it painful, but declawed cats often find it hard to function normally without the last bone and claw. As a result, many cats experience behavioral changes, such as becoming more aggressive.
Besides, if you're planning to have your cat go outside anytime in its life, I would highly recommend never to declaw your cat, since declawing leaves your cat defenseless, especially while interacting with other animals.
If your cat is clawing up furniture or other objects, I would recommend giving your cat more toys to claw at. In this sense, buying multiple scratching posts would be a very good option.
You might also want to consider discouraging your cat from scratching furniture by using a loud, firm voice whenever the scratching begins.
So, to sum up, having your cat's nails capped is definitely a better, more humane solution. However, this may not be necessary either if you provide enough toys to claw at, try to correct unwanted scratching behavior, and trim your cat's claws regularly.