It says something about how much the manufacturer stands behind the product. Black metal frames are made overseas. Expect to wait for a part if something breaks or if youre past that 90 day warranty, expect to pay for all replacement parts and associated costs to get your frame up and running again. Consider too that parts may also no longer be available should something break. Metal bars allow mattresses to slide into and through the gaps between each bar.
The other issue with the hollow bars is that if enough weight was placed on a spot they would begin to bend. The issue became so bad that a 90 day warranty was put in place by most manufacturers of these frames. Another issue the black metal frames suffered from were bending stretcher bars or rails. Again the hollow nature of these strecther rails presented issues with breakage and bending.
A lighter futon bed mattress is a good choice as long as it gives the comfort you want. If youre planning on using your futon mainly as a bed then a heavier futon mattress is usually going to be best option. Firmness is a measurement of the feel or give of the mattress when used as a sleeping or sitting surface. This quality is what people define as comfortable. Rigidity is the ability of the futon bed mattress to retain its shape along its edge when being used as a bed or sofa.
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