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I can't say anything specific about those 2, but if the company doesn't have an actual drop rating there's really no telling what's better. I have a K11 bumper that the company says is rated to 6 ft, and I have a full case that is only rated to 4 ft, so bumpers aren't necessarily worse than full cases.
 
In the case of tunewear, they have a TPU layer between the bumper and the phone.

I have seen many iPhone 6/6s+ users either without a case or with a thin transparent case. Perhaps a few of them have a bumper case with the gold pink. What are the reasons? They are not afraid of damaging the phone because of drops? As far as I read, if dropped, the screen could be broken easily.

They do seem to have a screen cover.
 
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