It can be better to have two dogs, so they keep each other entertained, but we do not recommend two puppies at the same time. It will be too hard to train them both – they’d rather play than listen to you, and one is likely to dominate and bully the other.
We recommend to wait a year (or more) then get a second puppy (or possibly a re-housed dog, if it’s used to having another dog around, and personalities suit). In these circumstances, a second dog can be a good companion for your first dog.
But, consider that you have to walk, train, and clean up after two dogs, as well as feed, vaccinate, and worm them – more cost.