Early pioneers building memory cards for personal computers, tended to use static RAM, because it's quite a bit easier to get to work. Later, dynamic RAM became de rigueur, for the simple and sufficient reason that it costs a lot less per kilobyte; as far as I know, the Vic-20 was the last computer to use static RAM for its main memory.
As far as I can tell, the difference in price per kilobyte became larger over time, as density increased. The ads in the back of Byte magazine are a good way to check memory prices... at least they become so from the late seventies.
But looking at 1975-76, I'm surprised I can't find any ads for DRAM chips at all. I wonder is that more because the cost advantage was not yet that great, or because it was that great but the hardware hacking community was not yet ready to deal with them, no matter what the advantage?
So: in, say, 1975, when the personal computer industry was just getting off the ground with the Altair and the Homebrew Computer Club: what was the cost differential between DRAM and SRAM?