I know this is probably a broad question, but actually I am hoping for a broad answer in this case.
I have a microcontroller for which I need some external SDRAM memory. Let's say the memory's density and configuration is supported by the given microcontroller. Does the package type and number of pins (i.e. 86-pin TSOP or 90-Ball TF-BGA) still matter or can I just choose whatever is cheaper/smaller/fits the PCB?