Wow, fast replies...
Yes, that is a good idea, I will try both formats and see how it is. I was playing around with the Calibre conversion options and I noticed that the ePub settings have a setting that allows me to remove spacing between paragraphs. I didn't notice this for LRF. So unless I overlooked something, that's a plus for ePub in my books.
Ok, gonna transfer some books to test it out.