Let me share my experience with both EET and Hiner. I passed Seismic on 2nd try. Here is what i did.
1st time - I watched on demand EET (60 hours.. yes it's long but worth it) videos, did HW, Mini Exams, and all CBT exams, and only Hiner's Final Exam. I spent around 150 hours on seismic 1st try. I was very confident before the exam...so much that i was over-confident and didn't do review because I was having 80% or more on CBT exams and I passed both 8 hours and survey on 1st try. . However, during the exam, I got panic and wasn't ready to break down the question. I spent more than 5 mins in a few questions and realized that i was 30 mins behind the schedule. Needless to say i failed the exam with Marginal, Deficient, Deficient, Marginal and Marginal.
For 2nd time - I reviewed EET's book from cover to cover, watched the selected videos that I feel i need to review again, Mini Exams and 1st Mock Exam (no more than 10 hours). This time on top of all EET's HW, Mini Exams, Mock Exams, CBTs Exams, I also did Hiner's 450 HW problems and Final Exam. THIS IS IMPORTANT - I realized that after my 2nd time studying materials, all the gaps between my seismic knowledge fell into pieces and i was able to make sense the seismic subject. Now, I can remember most of the formulas from EET's cheat sheet and that helped me to speed up during test and not looking at formula all the time. I tried to analyze what happened during my exam from 1st attempt and how i could do better this time. I have both EET's cheat sheet and Hiner's summary sheet, I'd say EET beats Hiner hands down.
I can't speak of Hiner's lecture since i have never taken it before. But I suggest you stick to one method (either Hiner or EET), master its cheat sheet (or summary pages), work problems from both EET and Hiner. Good luck.