I would definitely go with the Shimano. I believe it has more bearings, so it will feel alot smoother than the President. A friend of mine owned a President for about a month -- he hated it!
Shimano makes a superior product, so I think you will get better quality and longevity with the Sahara. Just make sure you get the Sahara with the revised spool lip -- it will give you longer casts and less line twist.