I think both formats are perfectly acceptable and am glad that I now have a choice.
But, for now I'm sticking with LRF. I agree with you Greg--I like the way LRF uses actual page turns to calculate the number of pages remaining.
I also like to access the table of contents frequently when I'm reading (to see how many pages the next chapter is, etc). I notice that accessing the TOC in ePub format can take quite a while--where with LRF it's fairly instantaneous.
One advantage of ePub is the ability to embed fonts directly in the document (haven't tried this, but there are excellent instructions in other threads). When I get a little time, I'm going to experiment with this.
dordale