Advanced Programmers Only: Initialize variables at declartion vs in constructor

This is more of a theoretical / best practice / most  efficeint method type of question...

The following two pieces of code have the same effect:

public class MyClass
{
    int test = 1;
}

public class MyClass
{
   int test;
   MyClass() {test = 1;}
}


Is it better/more effiecient/etc to assign defaut values when you declare a variable or to assign the values in the default constructor?
Is it just preference?

One advantage to initializing at the time of declaration is that if you have multiple values and multiple constructors the constructors only have to deal with the few values.

i.e.

public class MyClass
{
   int test1 = 1;
   int test2 = 2;
   int test3 = 3;
   int test4 = 4;
   int test5 = 5;
   int test6 = 6;

   MyClass(int x)
  { test1 = x;} // test2 through test6 keep default values

  MyClass(int x, int y)
    {  test1 = x; test2 = y; } // test3 through test6 keep default values
}

versus

public class MyClass
{
   int test1;
   int test2;
   int test3;
   int test4;
   int test5;
   int test6;

   MyClass(int x)
   {
       test1 = x;
       test2 = 2;
       test3 = 3;
       test4 = 4;
       test5 = 5;
       test6 = 6;
   }

   MyClass(int x, int y)
   {
       test1 = x;
       test2 = y;
       test3 = 3;
       test4 = 4;
       test5 = 5;
       test6 = 6;
   }
}

However if you can chain the constructors like so then does that advantage get counteracted?

public class MyClass
{
   int test1;
   int test2;
   int test3;
   int test4;
   int test5;
   int test6;

   MyClass()
   {
       test1 = 1;
       test2 = 2;
       test3 = 3;
       test4 = 4;
       test5 = 5;
       test6 = 6;
    }

   MyClass(int x) : this()
   {
       test1 = x;
   }

   MyClass(int x, int y) : this()
   {
       test1 = x;
       test2 = y;
   }
}


Comments appreciated....