Brother, I only read or buy one PUA book and field test it for 1 to 3 months before I buy and read the next one. I also break down goals into small, easily manageable parts.
Paralysis due to over analysis doesn't work. Test and adjust works. Some PUA books are total crap. I have come to the point though where I can go back to lots of PUA materials to freshen my memory or gain new insights that I've missed before.
If you don't field test what you read, then all PUA books are crap. When you do field testing, you'll get to separate the PUA crap from the PUA gems.
In short, get one and test it. Any of the two is a good choice as long as you test.
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Approach. Open. Escalate. Isolate
Here are my two essential rules on texting that will save you tons of time and money:
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