I have enjoyed both, but I would say Tomb Raider was the more enjoyable one for me. The storyline is fantastic, the graphics amazing, and the game is much, much less repetitive than The Division is.
However, the Division is fun to run around with other online players in, especially in the "Dark Zone". The missions outside, while slightly different every time, can be a bit mundane, but I have enjoyed playing it, and the graphics are also quite good.