EE first. It will fill up way faster, and your best bet is to head for it first thing. Not sure if FastPass is operating. If you think you'll like it enough to do it twice, grab a FP and then get in line. We did this with Soarin' and it worked great. Just keep in mind that you can only have one FP until the start time of the one you are holding, so if it is far in the future, I wouldn't go for it.
After EE, you can head over to Safari and if the line is too long, grab a FP for that.
Have fun. I haven't made it on EE yet, but I saw the lines when I was there. A friend of mine was there, and by the time they got there the lines were huge, and the FP was so far ahead they didn't even bother. Not sure what time they hit the park tho.