Question for XPro1 and XE-1 users

Providing in the next incarnation of the XPro and XE-1 bodies Fuji makes the same if not greater upgrades than they have made in the X100 and X20, which of these two features do you find more useful giving all other features staying the same.

The built in flash of the XE-1 or the OVF of the XPro1.  Other than these two features the two cameras are primarily identical image output wise and basically identical feature wise.

When you decided on one, the other or both was either the flash or OVF your deciding factor and why?

I'm considering one or the other as a travel companion to the X100/X100s with the 56 f1.4 as my second body lens but continue to go back and forth between the body options due to liking both the OVF and flash on the X100/100S.

Any input would be great.

Scott