Okay... VUZE is run on a Java Virtual Machine as mentioned above, and does take up much more memory than uTorrent talking 30-60 for uTorrent = 300/600 MB RAM for VUZE... but in exchange it is much more configurable, and has a much wider range of doodads... You can set it up so that it is a better seeder than uTorrent if you know what you are doing, but It's not necessarily going to help you out to any great extent if you don't want to spend time working on getting it tweaked out just right.
what I would suggest, if you are really worried about your seeding is to take a look into the basic settings of uTorrent.
First off, probably the quickest most effective way to drastically change how your uTorrent client acts towards the idea of uploading, is in the middle of the Queuing tab. There is a little check box that says "Seeding tasks have a higher priority than downloading tasks" What this means is that uTorrent will look to upload all of your seeding Torrents until they have reached the goal (set just above that check box) before it begins downloading any new files. This means that you can queue new things for download, and rest assured that your ratio will be maintained as a matter of course.
At the top of that settings page, you can specify how many torrents can run at the same time, and how many can download at the same time... You may want to increase the number of max torrents slowly (by 1 or 2 at a time) to see what your connection will be able to manage (if you notice a lot of torrents trying to connect, but not getting anything done, you have set the number too high), but the lower you keep the max download number, the greater the percentage of torrents will be seeding.
These items should help you to seed to your ratio in uTorrent...
