Hi ceasar2k6,
It would depend to some degree on the firmness choices you made (firmness is a factor in durability) but both of them use latex in the top 6". The Brooklyn Bedding Alexis is blended Talalay and the Spindle Abscond is 100% natural Dunlop and both of these are high quality materials and neither one has any weak links in the design so they would be very similar in terms of durability since the upper layers are the single biggest factor in the durability and useful life of a mattress. There is more about the different types and blends of latex in post #6 here.
Both of them also have replaceable layers.
Phoenix