As others have said, there is absolutely no reason to avoid a slightly wider rim on the front or rear... as long as the rim is not wider than the tire.
Others have mentioned a performance difference between narrower and wider tires and there is a difference (although a minute one) - if the width of the rim more closely matches the width of the tire, there will be slightly less aerodynamic drag.
Very slightly less. This means a wider rim might actually be slightly higher performance than a narrower one.
Very slightly higher - you would probably never be able to feel the difference in a million years.
Otherwise any difference you feel is 100% in your mind. Free your mind and your axles follow... I think that is the saying, right?
