I'm not very familiar with Lightroom. Comparing CaptureOne and Adobe Camera Raw I'm sure that C1 is much more powerful. Noise removal is perfect, shadow/highlights recovery looks more natural etc. It's functionality is regularly updated. Can't say this about Adobe.
But be careful with DNG's: dng editing is a bit limited in C1 - it's always recommended to use native RAW formats.
Yes, it costs much, but 3 month trial may be a nice experience. Even more: you can install C1 v8, use it 3 months and then upgrade to v9 and get additional 3 months of trial.