It's difficult to say without more information about your specific situation and playing style. Both cash games and sit-and-go tournaments have their own unique advantages and disadvantages.
Cash games offer more consistent earning potential and allow for flexible buy-in and cash-out options. However, they also tend to attract more experienced and skilled players, which can make them more challenging.
Sit-and-go tournaments, on the other hand, offer the potential for a large payout if you can make it to the top, but they also tend to be more volatile and have a higher degree of luck involved.
It's always a good idea to first understand your own strengths and weaknesses as a player, what you enjoy the most and what kind of variance you can handle. And then you can decide which one is the best for you.