Even though the technology is refreshed every few years, the basic functionality remains the same.
That said, better, faster processors and more memory are always good.
I have the entire SE united states 1:24,000 topo maps series along with the base map loaded on both hand helds and still have half a gig left.
I don't need another device with a camera etc......
For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.