all i need is to choose between dink \ grand dink \ xciting
These are quite different scooters. Weather protection (Dink has very small screen, Xciting adjustable (medium/big) screen), weight, stability/steering forces (GD with 12" vs. Xciting with 15"), footboard, pillion pegs, ...
What do you need or want to do?
Fast (at least a little bit more) are GD 250 and Xciting 250. Although the Xciting weight doesn't help during acceleration.
Thrifty is the Dink with its 200 injection (much better than the GD/Xciting 250 carb.)