If you provide us with more information about those two books (such as: version, publisher and content of index etc), we can offer you advice as good as we can.
Personally speaking, with strong accounting background, you may choose the harder one; or (I mean if you know little about journal entry, CF, F/S) please select the one which is more straightforward. In the long run, this policy will save you time and keep your momentum.
All the best.
Thank you.