Instance leveling

Q u o t e:
In your experience do you think that leveling a new character is faster nowdays by questing (if you know what you are doing or use a leveling guide like zygor etc.) or chain instancing?

You can level quite fast both through questing and chain instancing, so my advice would be to level the way you find most fun...You know the old saying: Time flies when you are having fun :-)