To me, the A3000 takes up more space and there's more wires by the time you add an external floppy and CD drive. One of the reasons I won't deal with a wedge system Amiga anymore. Not an issue though if I kept the A3000, 'cause I'd have Deneb to handle what I'd be doing on CD-ROM 
I have a Deneb+USB Ethernet and Audio, Picasso IV and a CSMK2/060/SCSI in my A3000, plus external SCSI DVD-RW and two external floppy drives.
I can't think of anything else I'd add to it.