As said above, there is a good argument to have both.
However, if it was a choice, or a preference (as asked) I prefer with DRM removed so that images can be written back to floppy without any special equipment.
A perfectly preserved thing that can't be used on the machine it was intended to be used on is pointless imho.
I've never understood the almost religious drive for perfect bit for bit preservation of something that can only be run on an emulator, which is surely a less accurate experience thus negating the point.
1977 VCS Heavy Sixxer (Boxed)
1990 Atari 1040STE, 4MB, UltraSatan, TOS 2.06, TT Touch -> Atari SC1435 Colour CRT Monitor
1991 Atari TT030, 2/64MB, Int 8GB Gigafile SCSI2CF, TOS 3.06, CaTTamaran Accelerator -> Atari TTM195 19" Mono CRT Monitor
1993 Atari Falcon030, 14MB, Int 8GB HDD, TOS 4.04 -> Atari PTC1426 Color CRT Monitor
Amiga, Mac, DOS, SGI, Sun, NeXTStation, PDA's and more!