Hey there. The thing that SRAM designers are mostly concerned with is the density of the SRAM, which requires minimum number of elements to be used. A latch can be implemented in a very small area while a true edge triggered flip flop is not as small. And they usually can get away with this because their clock timing, data, sensing cycles and everything are tightly controlled with an internal circuit. So you don't actually put the latch in a condition that it's not happy.
Actually don't take it from me, design and layout both of them and compare. It would make a difference in power too. Anyway someone with more experience might go beyond this but I believe this is the first level consideration.