GTO is a subject I have recently become interested in and admittedly, up til now, know very little about.
I've decided to invest my time in doing a pretty in depth study with the resources available to me.

I can think of three main sources to start learning/studying from and would like some opinions on where to start and if is superior than the other for 6max player. Being as this will be a long ongoing study with allot of hours and days invested I would like to maximize my time investment.

Applications of NLH by Matthew Janda:
I have the book and most of Janda's Cardrunners videos which basically reinforce the chapters in the book.
From what I've read/seen so far, Janda is very easy to follow and I really like his flopzilla range work/examples.
I've also heard that his pre flop work may not be the best due to some of the assumptions he made but surely there is still much to be learned provided one understands where the flaw lie?

Mathematics of Poker By Bill chen & Jerrod....:
I do not have the book but I do have a large videos series from DC that dedicates one video per chapter of the book.
TBH taking this on is a bit intimidating as I am not very good with math and they have a way of expressing even the most simple algebra like Bet / (2xbet + Pot) in the most daunting and intimidating way. To the point where I would never know it's the same thing expressed differently without going through a large process.
Even so, I will take it on if it is imperative to my progress.

Expert HUNL by Will tipton:
I have niether the books or his videos but his work seems to be at the top of whats currently out there.
I have no idea where it ranks in terms of complexity or ease to understand but once again I am certainly up to take it on.

As for software, currently I only have flopzilla and equilab if I were to invest in one the the following which should it be and why?

CRev
GTORB
PioSolver

From a financial point of view CRev probably makes most sense but I am unsure if I'm just burning money by comparison..

Thanks for your thoughts input.
If you have other suggestions for books, videos or software please let me know.