Both are equally likely to produce useful counter-terrorism results.
The most effective thing to do for counter-terrorism is to keep blowing up families in the Middle East and occupying "holy lands". Keep bombing villages until democracy emerges.
To do so, we need ever-stronger Nation States, and giving them the ability to monitor all of their subjects' domestic communications is a good rung up on that ladder.
Also, Facebook is the real danger to world peace - so be very upset about their ad network and don't bother encrypting your traffic.