I have read alot about Shackleton and his expeditions but to read his own version (admittedly, he cobbled it together from diaries written by himself & the whole team) is extremely interesting.
Sir Ernest has a very modern style of writing (unlike many authors of his generation) which makes both books a joy to read.
He knows the reader wants excitement, suspense and adventure and delivers plenty in both stories.
Although, he did have a ghost writer (he hated writing and needed someone there to drag the tales from him!) you can hear his voice echo through the pages.
Forget Scott - if you want real edge-of-your-seat stories about Polar Expedition, then Shackleton is your man.
I would also recommend his bio by Roland Huntford as an excellent accompaniment.