Properly initialising variables in modern C++ (C++11 and above), using () or {}?

The C++ reference pages say that () is for value initialisation, {} is for value and aggregate and list initialisation. So, if I just want value initialisation, which one do I use? () or {}? I'm asking because in the book "A Tour of C++" by Bjarne himself, he seems to prefer using {}, even for value initialisation (see for example pages 6 and 7), and so I thought it was good practice to always use {}, even for value initialisation. However, I've been badly bitten by the following bug recently. Consider the following code.

auto p = std::make_shared<int>(3);
auto q{ p };
auto r(p);

Now according to the compiler (Visual Studio 2013), q has type std::initializer_list<std::shared_ptr<int>>, which is not what I intended. What I actually intended for q is actually what r is, which is std::shared_ptr<int>. So in this case, I should not use {} for value initialisation, but use (). Given this, why does Bjarne in his book still seem to prefer to use {} for value initialisation? For example, he uses double d2{2.3} at the bottom of page 6.

To definitively answer my questions, when should I use () and when should I use {}? And is it a matter of syntax correctness or a matter of good programming practice?

Oh and uh, plain English if possible please.