Which of these would benefit the cycling of the tank best?

Marineland-Bio-Spira

Hagen-Cycle

Please don't cause an uproar, I'm doing a research. Thanks.

Hi...I'm new to this forum. I was told to post my question here and since you guys know more about what I would like to ask.
This is in ref: to Cory's

1. Are they sensitive to any medicine?
2. salt?
3. substrate?
4. water parameters?
5. Anything you can tell me so I can be knowledgeable on keeping ...