The DKB Rapidfire is far and away the best of the lot, if you have SCSI drives. It's quite a bit newer than the A2091 and DKB used good build quality back in the day. (They were always one of the companies I considered "upper-tier" on most items)
The A2091 needs ROM updates, and more RAM to be very useful.
The Buddha IDE controller is probably ok, but with no RAM options, you'll want more RAM for your system somewhere. Of course, this isn't a problem if you already have an accelerator with RAM. It also uses cheaper IDE drives, if you have no SCSI drives to use.
