Never read the books, so that didn't matter to me. Honestly, if the divergence made it easier to follow in TV form, then good. It was still too difficult to follow.
On Silo, I started the first book recently. The show builds slowly but I'm reading the book in part because it really sucks you in. So many possibilities exist that you can't help wondering what is really going on. Are the baddies the baddies? What do they know? Is what they know even accurate? I found the Silo fascinating, despite similarities to some other stories like Logan's Run.