It doesn't make a difference if you are just starting out in pool. Both are enjoyable to play and can be used as a competitive game, but one has a lot more opportunities for winning. The best way to decide between them is to look at your individual style and your gaming skills.
8 ball is a great way to pass the time, whether you're a beginner or an experienced player. There are more chances to score and it is easier than 9 ball. But the game is more challenging than you may have experienced. The rules of the game, including the rule to pocket the balls numerically, are important. You will also need to know how to shoot the balls.
You will need to be able to tell when you should make a pocket, when you should run out, and when you can play safe with the 8 ball. If you want to make a run out, you will need to pocket all the balls on your side first, then make the 8 ball. It may be necessary to make at least a few pocket shots depending on the tournament. You should still be able make the 8 ball in just one or two shots.
There are many similarities to the 8 ball as well as the 9 ball. For example, you have two options. You can use a triangular to guide the ball to the right spot, and you can also play the 9-ball with slop. You cannot pocket any 9-ball ball. You have only a few chances to make 9 ball shots, and the only one that counts is the "Golden Break," which will give you the win, regardless how many of your balls were used.
The Golden Break can be taken right after your break. If you make the shot, you can run out to win the game. You will need to feel the cue ball well or else you might be surprised. You will struggle to make the 8 ball if you don't have it. There are many rules to 8 ball. However, the general rule is that you must be very precise in your shots. The game is not as easy as it sounds.
The main difference in the two games is 8 ball is slightly easier than 9 ball. But it is harder to master. There are many national rules that govern 8 ball. You'll need to be familiar with them if you want to play. Remember that rules for 8 ball are different from 9 ball.