Roto, I currently use U-torrent because I have to it's good it's not quite as gadget filled as Azureus but it also does not require a java applet to be present to run. I think Azureus is more detailed but U-torrent works great for me, just a little easier at times. Only hard part at first was the restrictions settings on my upload speeds and down speeds once I figured that out it was great.

I'd say to chose between the two as to which is better, personal taste and preference, U-torrent works just as well as Azureus but Azureus has a nice couple of options on it such as the swarm which allows you to see the packages being delivered in style...I used to watch that if bored for like 5 minutes and then go do something else.

Java applet is what makes azureus take up so much processing power...in relation to jowy's post.