I have both-1 maltese, 2 havanese . I got my first dog- my maltese Belle cause I lived in an apartment and traveled a lot. She is perfect for that and loves going into a traveling bag (she knows it means bye bye). Belle weighs between 4.4 and 5.2lbs in her adult life so is very easy on the shoulder. I actually got Belle from a breeder who used the same stud as my friend and she has a calm lap dog maltese and I wanted he dog. Well, there was something else in the plans and I thought the little white peanut that was beating up the other puppy was adorable. To this day, I have a pistol
Belle barks when she is happy, sad, having fun, mad, etc. On that note, I have known some very calm maltese though. But in Europe, they often referred to as the maltese terrier (or terror!) After having Belle as a first dog, I do absolutely love a dog with a lot of personality, somedays I just wish it wasn't my dog
She is now going on 7 and hasn't calmed down. She still likes to chase after the birds, play hard, but she is the world's best therapy dog too. She can sit on laps for hours.
My Havs- one hardly ever barks and one is more vocal in nature. If Dora barks, something is wrong. Dash can be vocal but he is vocal when he gets hyper and we do agility which encourages it, he barks at other dogs to get them to play, etc. I find it adorable that he uses his voice. Ironically, Dash is the dog if you tell him enough, he is the first to get quiet. When we stay in hotels, etc the slamming of doors never spokes him. Dora on the other hand goes into guard dog Dora. Dasher is a tad under 10lbs and Dora is 12lbs and could probably lose a pound and get back to her girlish figure. They are both relative lap dogs to some other havs but I do find them a lot heavier to put in a bag and take on the go, they are about double Belle's size.
So maybe you should think of how often will you be traveling with them? There are the bags on wheels if they are too heavy on your shoulders or backpacks, Maybe I have a bigger lap than you but they both fit on the laps relatively easy. Any dog can be smashed when it gets busy. I took Belle a few times in LA on the Metro and I just tucked her between me and the seat (she lives for visiting with people so I hide her from them cause eye contact gets her going).
But my best recommendation, which ever breed you decide, I would really say go meet the parents, see how they are in personality. Belle's dad was calm but her mom was a barker, hence the personality I got. We joke her and her cousin the only thing they have in common is they are both white. Belle was a terrorist to her from the moment she met her especially with her being that submissive. I met Dasher's parents and his mom loved to be on your lap and his half brother talked to me quiet a bit. Personality is very much inherited and I think that might help you find your perfect furchild.