That's a tricky question! It depends on what you mean by "larger".

* Titan is larger than Mars in terms of surface area. Titan's surface area is about 83% of Earth's, while Mars' surface area is only about 38% of Earth's.

* Mars is larger than Titan in terms of volume and mass. Mars has a volume of about 1.63 x 10¹¹ km³, while Titan's volume is about 7.15 x 10¹⁰ km³. Similarly, Mars' mass is about 6.42 x 10²³ kg, while Titan's mass is about 1.345 x 10²³ kg.

So, the answer depends on what aspect of size you're interested in.