Hi needanewmattress,
There really is no “best” type of innerspring because it depends on preferences and on which type of innerspring is inside the mattress “as a whole” that is the best match for you in terms of PPP. There is more about the different types of innersprings in this article and in post #10 here.
A a pocket coil is a good choice for those that prefer less motion transfer in their mattress and it is also more contouring than innersprings that have coils that are joined together with helical wires. In some cases they can be less durable than other types of innersprings but this is not usually an issue because the support core of a mattress is rarely the weakest link in a mattress.
A hybrid means a combination of two standard mattress categories. As an example a hybrid between a latex mattress which uses latex from top to bottom and an innerspring mattress which generally uses an innerspring with polyfoam comfort layers would be a latex/innerspring hybrid. Another example would be a mattress which uses memory foam over innersprings because a memory foam mattress usually has memory foam comfort layers and a polyfoam support core so it would be a hybrid between a typical memory foam mattress and a typical innerspring mattress. It’s a “loose” term in other words with no exact definition which is used to provide a very general description of a mattress that is a combination of two different mattress categories.
They aren’t particularly new no but they are becoming more common in the industry as manufacturers look for ways to combine materials and components together in different ways to take advantage of the properties and strengths of different materials and components and to differentiate themselves from other manufacturers.
Phoenix