I'd do a search on the forums about this, we have had the debate a few times. Many people use Prime, I personally use bigal's generic version of stress coat. Never heard of the bio-safe one you're talking about...and don't have any experience with the pro kent one either so I'm afraid I can't help with that. You just need to make sure that it does what you need it to, mainly dechlorinate
There are some products that kind of look like conditioners but are NOT dechlorinators, so be sure to read thoroughly.
Good to see you back