Something to think about if you are considering a Maltese is that they really need their people and do best if they won't be alone too long. That said, I do believe quite a few Maltese folks successfully leave their babies alone for a full workday.
If you are getting a puppy, they need a lot of care that first few weeks to ensure that they are eating properly. Some are very picky eaters and will starve themselves into hypoglycemic shock (don't listen to your vet or anyone who will tell you that a puppy won't starve itself and to just wait until s/he eats. People who say that are not familiar with the tiny breeds and don't know about their tendency towards hypoglycemia, which can be fatal).
Mine are very intelligent. One is very hyperintense and needs a lot of attention. The other is more laid back, but also needs a lot of attention.
The puppies vary in care level and training needs. Sylphide was a bratty maniac, very intense, and needed a lot of training. Shrek is very laid back, much less adventurous than Sylphide, and hasn't needed as much training because he both listens the first time and doesn't get into mischief. This said, with careful, loving attention and training Sylphide has matured into a wonderful, loving, obedient adult.
Some Maltese are passive. Others are not. I have a very assertive, bossy one who always gives us a piece of her mind. Both of mine think they rule the street when we go for walks.
This said, we adore our babies, they are spoiled rotten, and we will forever be a Maltese family. They are wonderfully intelligent, have a mischievous sense of humor, are marvelously affectionate, and have simply adorable personalities.
Hope this helps! Good luck in your decision making.