So after some testing I have compared with KDE 4.6.
Search function with indexing: They both have it and they both work very well - a upper hand for Gnome 3 here.
Because you do not have to be in the search field to make it work-you just start writing. And you can expand your search to Google and Wikipedia with a klick (you do not even have to open your browser)- Gnome 3 is saving us from a lot of clicks here.
Gnome3:
 | KDE4.6:
 |
The famous side by side Window heavily marketed from Gnome and Win7

They both have it and even if Gnome has been marketing this as a new feature KDE4.6 is better here!
Switching of workspace.Totally different concepts I think Gnome3 can be the most efficient one with some training. Gnome3 has some key combos that makes life easy and fast. But out of the box KDE4.6 is the easiest one to understand.
It is a draw.
Menu structureDifferent concepts again. While KDE4.6 has a lot of flexibility here and lets you set up menu layouts Gnome 3 has decided what is good for you.
In KDE I have the text menus where I can pick my programs. In Gnome 3 you have the categories and the rest is all about icons all over the screen.
Out of the box Gnome3 is easier to understand for a newbie, but you can have the same in KDE if you choose to set it up like that.
I kind of miss the good ol' text menus so a slight upper hand for KDE4.6 here.
StabilityFor the first time in history KDE4.6 has a slight upper hand. There are some bugs that will be fixed in Gnome 3. and when you know what to avoid it is quite stable.
But too many circumstances makes it crash at the moment. So KDE4.6 is the best - for now!
Example: If you have both KDE and Gnome (like me) you need fusion-icon for setting kwin when in KDE. If you forget to set it back to Compiz before you log out; Gnome-shell will crash and you can log in and out as much as you want - it will continue crashing until you have altered the setting (back to Compiz) in KDE.
Gnome3 is still a baby - I am confident that it will grow.
3dKDE has it! Gnome3 does not. KDE is in front here.
Resources Gnome3 is does not pull much CPU power and memory. It is light weight. KDE4.6 does pull
way more CPU power.
There is no doubt: Gnome3 is ahead by a mile.
So can we conclude who is the best now?
No!

So I'll continue testing then.....