I'm not going to involve myself in a fight of wich client is the best .
But the problem is that they all try to show of with their looks .
I have a list of over 25 Gnutella clients .
There basicly all clones of the original Gnutella application itself exept for their GUI .
If you go under the skin of the clients you will see that the only ones actually trying to implement new functions and improve the network are LW and BS .

Now Bearshare can be installed without Spyware and ads if you watch out and don't just click "Next" .
LimeWire has spyware but you can go to Clean LimeWire to get a version without spyware and ads .

So the real war is between BearShare and LimeWire .
And since BearShare is free , they do have a slight advantage in long term .
On the other side you have LimeWire wich keeps popping out new versions with mayor improvements each time .

Up to you to make up your mind .
I'm just telling the facts here ...