As you're saying yourself the jack version will probably be the best for you if you intend to use the extra outputs live on stage unless you spend a small fortune on an ADAT converter.
I have the ADAT output board for my E-6400 Ultra for 16 digital outputs / 8 digital inputs and I love it.
I purely use it for studiowork though so I don't have the 'plug-into-analogue-equipment' problem that you may encounter
Some people say the analogue outputs sounds better too (the converters) but I can't hear any significant differences (if any at all).
That's my two cents;
/Dane