Ask me anything
The past for sure.
Though I'm contented with what I have, but the fact that I know what would likely happen in the future would definitely assist in me securing lots of upsides in the past.
Besides, going to the future would mean you'll be starting from scratch in terms of knowledge.
This is of course, based on 1 way time travel. If it's 2 ways, probably future (providing if I change something in the past, it has no effect to my current life, if there is, might be the past too. LOL)