If you have swap available, you pretty much always want to use swap-backing for memory disks -- if there's room in memory they will run as fast as malloc-backed, but you don't have to be as worried about the "Oh shoot, I'm out of room" case.
Actually, there is one consideration: swap-backed memory disks have a sector size equal to the machine page size. This will result in some inflation in memory usage, and can confuse program which expect a sector size of 512 bytes (for example, dd, which I plan on fixing but I haven't gotten around to yet).
Colin Percival
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