As a water conditioner seachem prime is unbeatable.
Api water conditioner vs prime.
Quickstart is a live bacteria product that is as you said used to decrease cycling time.
Stress coat prime and lots of other things are called tap water conditioners.
Both are ideal for use with prime.
Ask any aquarist to recommend a good water conditioner and seachem prime will likely be the response.
I ve not used it but i have used other live bacteria products such as microbe lift.
The formula of api tap water conditioner incredibly concentrated.
Some water conditioners like stress coat also neutralize heavy metals and help replace damaged slime coats.
It will also detoxify any heavy metals found in the tap water at typical concentration levels.
This conditioner comes in liquid form.
It also detoxifies heavy metals in tap water.
50 ml 100 ml 250 ml 500 ml 1 l 2 l 4 l.
When transporting or quarantining fish use seachem stressguard.
Not only is seachem prime a complete conditioner but i found that it lasts the longest.
When adding new fish use stability.
Seachem prime fresh and saltwater conditioner 4 8 out of 5 stars 11 294 1 best seller in aquarium water treatments.
Use at start up and whenever adding or replacing water.
Api tap water conditioner similar to the seachem api tap water conditioner will remove chlorine from the tap water and will also work to eliminate heavy metals and chloramine.
You will want to use only a drop per gallon 3 8 litre as it is very strong.
It should be used with every water change.
As you said prime is a water conditioner one of the best imo that neutralizes ammonia and other toxins from your water.