Both have good intentions but are extremely dangerous to Internet Freedom and On-Line innovation and business. If these bills are passed any company can accuse a Website of copyright infringenment on "a good faith belief" and have them shut down without due process. It would allow the U.S. Government to restrict Websites much the same way the governmnets of China, Iran, and Syria do.
The U.S. sets the standard when it comes to the Internet. The U.S. is also hurting for jobs the last time I checked the news online. This would also limit start ups and innovation.
My personal paranoid opinion is the U.S. Government has witnessed the part the Internet and Social Media has played in the revolutions in Egypt, Tunisia, Syria, and the failed attempt in Iran, and are looking to be pro-active in having a way to shut everything down when we finally get fed up with the two party succubus. The less information we have and exchange the better, right?