The Early Reader's Bible is the easier of the 2, as it has a more controlled vocabulary. We jumped into reading this one as soon as Allison finished The Reading Lesson, and it's going really well!!

She just turned 6, and my plan is to keep her reading through the summer (most days at least

) and use both Bibles with the Emerging Readers. So, we're starting with The Early Reader's Bible and then we'll restart the set with The Beginners Bible. It will stretch the set out an extra 9 weeks for us, but I think that will be good so that we don't get to the harder books too soon or DITHOR.
You sure don't have to use both Bibles though. One or the other works great (and that's how Carrie wrote it), but I've seen several moms whose kiddos were ready for the Emerging Readers early take this route, so I think it will work for us.

Kathleen