Welcome Dan!
In my personal experience this all depends on your training experience. I have been training for a few years now, so after 4 weeks I start getting bored and need a new program. That is why I like Chad's programs. Most of them are 3-4 weeks, take a week off, and then start a new one.
In the book, Chad has abbreviated some programs down to 4 weeks including ABBH. I have done most of Chad's programs once and am currently doing week 7 of the Waterbury Summer Project which changes every 2 weeks. If you have been training for over a year, I would suggest trying any of his 4 week programs and then another one after that. The year long program in his book is the way to go because of the variety of the workouts. If you are looking forward to your next workout it is a lot easier to be consistent.
I preferred most of Chad's programs over the 2 you mentioned, but they are more of the beginner routines compared to some of his others. Total Body Training, Triple Total Training, and SOB Training are some of my favorites. Waterbury High Frequency Training and Waterbury Summer Project are also great programs, but I find these way more demanding and can only do a cycle like that once a year. I am looking forward to trying the Total Strength Program after I am through with this and 10 x 3 For Fat Loss for the summer time. I will start a workout log on this site once I do to track my progress.
Chad is the king of changing rep ranges, which to me is the best way to keep your muscles guessing. So in summary, I find the longer you train the shorter I like to go before changing exercises, 2 - 4 weeks to avoid mental and physical burnout.
Good luck and get the book, you won't be dissapointed!
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