Premiere Pro CC is available as a subscription (updates to new versions are included in the monthly subscription fee) only and not as a stand alone purchase where as you can purchase Final Cut Pro X with a one time free.
Final Cut Pro $299.99 (Trial version available if you would like to try it before you buy it)
Motion 5 $49.99
Compressor $49.99
Adobe Premiere Pro $19.99 per month (available as a subscription only)
Any additional app such as After Effects or Photoshop is $19.99 per month as well.
The Complete package (which would include Premiere Pro CC, After Effects CC, Photoshop CC and many others) is $49.99 per month which gives you access to all of the apps (well except Premiere Elements or Photoshop Elements which you probably would not use anyway).
I agree with Ijack, you should do a search and see what others have to say about it. I use Premiere Pro (on a Mac and PC) but can't tell you which one is best since I've no experience with Final Cut Pro X.