I have had this debate many times, I think Gore is generally a little harder than Bailey, but it really depends what you are more comfortable with (what rapids you run and how you run them matters too). Gore is a river run, the rapids are bigger, but it is pool drop for the most part. Bailey has smaller rapids, but is much more continuous.
900-1,000 cfs is a pretty forgiving Gore level, and you should be ok with some scouting. Remember everyone gets a free pass in Tunnel on their first run so don't even worry about it.