Hi jwolf02,
Innersprings are a support component and the support layers of a mattress are not usually the weak link of a mattress. The reason that innerspring mattresses have a “reputation” of being less durable is because innerspring mattresses made by the major manufacturers that so many people end up buying (they dominate the industry) use lower quality less durable materials in the comfort layers which is usually the weak link of a mattress (a mattress will tend to soften and break down from the top down).
If an innerspring mattress uses good quality and durable materials in the comfort layers they can be a very durable choice and some of the most knowledgeable people I know that could sleep on anything they wanted sleep on an innerspring (often with latex comfort layers) although of course each person has their own preferences.
The choice between an innerspring and other types of support layers is more a matter of preference, performance, or budget rather than a more or less durable choice.
Outside of how well a mattress matches your specific needs and preferences in terms of PPP … a mattress is only as good as its construction and the quality of all the materials inside it and while it’s always important to make sure you know the quality of all the materials and components in a mattress, it’s most important of all to know the quality of the comfort layers which will generally be the first to break down.
There is more about the factors that can affect the durability and useful life of a mattress relative to each person in post #4 here and the posts it links to.
Post #2 here has more about a latex/polyfoam hybrid vs an all latex mattress (which would normally be a budget choice).
Post #28 here and Post #2 here has more about the differences between an innerspring and a latex support core (which would normally be a preference choice.
There are too many unknowns, variables, and personal preferences involved for anyone to recommend any specific mattress for someone else (see mattress firmness/comfort levels in post #2 here) although I’m always happy to help with “how” to make the choice that is best for you.
Phoenix