The Tiger 2 has been redesigned with laser cut parts. The 4* also has laser cut parts.
The Tiger has a symmetrical airfoil that allows you to do more precision type aerobatics while the 4* has a semisymmetrical airfoil, more forgiving than the tiger but also more limited. Personally, the way the parts fit on the Tiger are better than on the 4*, it almost stays build without any glue added, thats how nice the construction goes. BUT DONT FORGET TO ADD GLUE!