Go for a National Cert:
There are other national ones, I just can't remember them, but these are probably the most well-known. It's an industry accepted standard to have a "nationally-recognized certification". And if you move, you don't want a certification from your local "Joe's PT Cert Shack" that your employer or clients have never heard of. All the info is on their websites. I believe ACE is the easiest & ACSM is the hardest. Typically, the harder the cert, the higher the quality/respect it will have.
P.S. the ones I listed all require CPR/AED prior to taking the test, which is easy to get, but you would want to keep that in mind when scheduling. They don't make any exceptions and will turn you away from the test site if you can't show proof of CPR/AED certification.