It is a fun job if you are not attached to specific industry or product.
For example, in investment banking, some bankers may specialize in IPO, trading desk, etc. For IPO banker, they may think that they can arrange a an IPO with overwhelming subscriptions and the share is listed. They may view this as the best in the career. Alternatively, for traders, if they can make an transaction with good profit, they would view it as their success.
So, it is really different on the sector and people's own view. There is no definite answer on this.
Hope I can answer your question!
The best part about being a banker is being able to stay in the center of the flow of capital, working with and analyzing companies that shape the world around us. This is also an industry that challenges you to learn something new every single day as there are so many unknown forces and variables at play, from geopolitical events to new technology that impacts the trajectory of the economy.
Hope this is helpful!