All in all Capture One is the best of the bunch, but everyone has its own plus and minus, so it's also a matter of personal taste. For example, I use Silkypix for regular conversions, because of its wonderful color rendition and brilliance, and the CA, rotation and perspective correction tools (the best of any Raw converter in my opinion), but when it comes to exploit the whole resolution for big prints, I rather go with C1 or Lightroom (I do not use LR on regular basis also because I hate its way to force you to handle libraries). You can try them all, and do not forget Bibble Pro 5, which is the fastest, by far, or DxO which is the most "authomatic".