That's like asking what is better to use, a Boeing 747 or a Ford F150. Depends on what you want to use the thing for. If you wanted to carry 100 people across an ocean, you probably don't want to get into the Ford. It will be cramped and wet.
You need to ask to compare 2 CPUs or 2 Video Cards, Apples to Apples and all that.
Your current laptop specs and what you do with it would help also, just because it's slow does not mean it's a slow laptop, you could have 20 viruses on the thing.