You should consider both slow and faster things but I would go for realistically faster. I know how it is to want to play super fast and yet not be ready.
The main thing is that you are accurate and extremely clean in both your playing slow or fast. Crank your distortion very high and try to play as cleanly as possible.
Playing outside your comfort zone is always a good thing. You just don't want to stay there too long if you realize it could be much cleaner.
