I would say learn BFD3 and Eco will seem like child's play afterwards.
BFD3's work flow and design was partly taken from Eco, like having the mixer always visible.
There's
BFD3 Demystified from MacProVideo and then there's groove3's
BFD3 Explained.
I bought the latter but from the previews I prefer the look of BFD3 Demystified and it's the cheaper option right now but they're both excellent.
Steve