i have used both ..no much difference..the good traction you find in 4wd in excellent also if you are more worried about economy than you can remove shaft and install when you going for some special snow event when every one stuck and you carry on..
bro if u have both then can u tell me that how much mileage did ur 4*4 was giving. As mine is giving around 8-9 Km/L with shaft ON. Did u got more after removing the shaft?? Reply please