any martial arts is fundamentally good for you. it improves your fitness and confidence in yourself.
whether they are effective in a self-defence situation is entirely a different matter and it is a matter of personal opinion and personal experience.
If you are comfortable with boxing, then take it.
If you don't, or you find you have difficulty with the style or training, change it.
Just understand the reasons you take martial arts.
Self-defence? Confidence? Fitness? Spiritual completeness?
Think about it.
As for myself, i take Wing Tsun.
The original form.
I like the fluid dynamic of the combined defence and attack principle.
I enjoy the spiritual aspects too, as it express the philosophy of Ying & Yang of Taoism.
and science, for every action there is an equal opposite force.
Avoid the "corridor of death", go for the "outside gate"
Tackle every problem not head on but at an angle, where it's leased expected.