So let me get this straight- you are wondering if you should read the 2500+ page Harrrisons with tiny print, or the 500 page Step Up....
Probably Step Up if I were to guess because you will neither remember nor get through Harrisons.
Nope, I have one, if I'm not mistaken, a couple of hundred..it sums up the full version of Harrison's. You can read it first and if you're interested in more, you can supplement it with the full version