With the power we have available to us now you won't notice any difference in acceleration or top end.
The location of weight within the car is a very useful tuning aid, it isn't simply the overall weight which is helpful, it's the distribution.
You ask the question stating 'just' on overall weight alone. The answer would depend on the surface you are running on. As a basic rule of thumb, weight settles the car over moderate to high traction bumps, depending on the distribution it also helps on low traction surfaces. However it also also can help in high traction, flat surfaces - if the weight is towards the front. If you are running on a smooth medium to high traction then potentially lighter may be better - but the overriding factor is the location of the weight, not the overall figure.
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