My pick would have to be the A Whole Nother Story trilogy, in which (spoiler warning) you can only travel back in time. But because time is in a loop of sorts, if you go before the beginning of time, you will be at the end of time. From there you can go back to any time you want to. And time paradoxes cannot be produced. Plus, your memories from the previous timeline exist as well as the memories from the new one.
I didn’t love the style of the book but I thought All Our Wrong Todays had a great take on the concept of time travel. Time And Again has some cool elements to it as well. I enjoyed the way both authors approached the subject even if they weren’t what I’m usually looking for.