GTA San Andreas is a 3D open world action adventure game ported from the Rockstar classic. It contains everything from the original, but has been tweaked to work with touchscreen controls.
Pro Familiar multi-city world that is actually based off of real locations
There are 3 huge cities to explore: Los Santos, San Fierro, and Las Venturas - each loosely modeled after certain real-world cities. In addition to the static map, other aspects of the game make it feel even more immersive. There's a fairly wide selection of vehicles, minigames and weird one-off events to find and take part in.
Pro Tons of content will keep you entertained for a long time
You could spend days going through just the main story itself, but there is a ton more content as well. Side missions add numerous more hours of gameplay, and one-off encounters can help keep you entertained as well. Depending on your mood, you might even just want to try abiding by all the laws and driving around. In-game, there's always something to do, and you have a choice of what you want to do during that particular gaming session.
Pro A classic that translates great to mobile thanks to attention paid to the port
This game was originally launched on PlayStation 2 and Xbox. Tweaks were made to make it more mobile friendly - multiple ways to control the UI (optimized for touch), as well as cloud-saves which let you pick up where you left off on different devices (for example a tablet or a new phone).
Con The control scheme doesn't translate well to touchscreens
For a game that was originally designed to be played with 14 physical buttons, it can be difficult to translate that to a touchscreen interface. Sadly, this shows when trying to play on a tablet or phone. To get the best experience, you're going to want to grab a compatible Bluetooth gamepad/controller which adds cost, and you'll need to carry it around if you want to play on the go (likely at home you'll be playing on a console or computer).