Is it better to climb with others or alone?

This is a really general question. It depends on a few things:

1. Why kind of climbing are you referring to?
   If its bouldering, then you can climb on your own, but if sport climbing, then you require one more person to belay you.

2. Why are you climbing?
   Assuming the reference is to bouldering, then the question is why you are climbing. If you are climbing to just detach your mind from the day and to just be physically active, then yea, you could climb alone, and it may be better also if you just don't want to deal with people.
   On the other hand, if you are bouldering with the goal of improving, then I would say both options are important for your progress. Climbing with other people, especially those that climb better than you, can really give you more insight into climbing, more ideas, betas, experience, and just more growth in general. Climbing alone is still important in my opinion though because it's when you are alone that you can actually practice all that you have learned with others.

That's my take on climbing with people vs climbing alone.

Extra point:
I personally find it quite hard to have a proper bouldering session with some friends. Instead of climbing hard routes, we end up just messing around.