It's difficult to say definitively which planet most known extrasolar planets resemble, as there's a huge diversity in their properties. However, gas giants like Jupiter and Saturn are the most common type of exoplanet discovered so far.

Here's why:

* Detection methods: Current exoplanet detection methods (like the transit method and radial velocity method) are more sensitive to large, massive planets that exert a stronger gravitational pull on their host stars.

* Formation: Gas giants are thought to form further out in protoplanetary disks, where there's more gas and dust available.

However, it's crucial to remember that:

* We're biased: Our detection methods might be overlooking many smaller, rocky planets that are harder to find.

* Exoplanets are diverse: We've discovered many other types of exoplanets, including:

* Super-Earths: Planets larger than Earth but smaller than Neptune.

* Mini-Neptunes: Planets with thick, hydrogen-rich atmospheres.

* Hot Jupiters: Gas giants orbiting very close to their stars.

So, while gas giants are the most commonly found exoplanets, the picture of the exoplanet population is constantly evolving as new detection methods and research reveal more about these distant worlds.