One of them potentially prevents your phone from getting damaged and saves you the time & trouble of getting it repaired.

The other keeps your out of pocket cost lower if you do need a repair since you have pre-paid part of the repair cost in premiums and will now only have to pay a deductible. It doesn’t do anything to help prevent damage though.

They are different products made to do different things. I don’t use either. I would choose AppleCare if I had to pick one because I can’t stand having a case on my phone.