>long-term storage perspective,

Any format is fine for long term storage as long as it has a CRC. Just slap a couple of PAR2 with the file(s) and that should take care of small damages and it even adds an extra CRC as bonus.
I would be more worried about endurance of the CD/DVD support - I have had CD-Rs go bad on me. For safety better burn the data twice on 2 media (2 CDs or 2 DVDs). For extra safety, better put the second medium (CD/DVD) at a remote place.