I will choose 2. In space. Is better and more interesting. Also an opportunity to go far far far away from this crap world. Travelling in space also imply a travel in time. Because if you decide to come back in the original place, you will find out that your body is only few years older, but on the original planet were passing hundreds of years.

If you choose 1 - in time, you will create a butterfly effect and your life will be a nightmare. Why? Because human nature to change things in the past, thinking that will make a better future. Wrong. Changing the past will create an enormous wave of changes, not only on your life but others too. And that will affect in unimaginable ways your future.

In conclusion, if you have such powers, try to travel ONLY into the future, not going back into your past.