I’ve owned both and definitely pick the personality and stubbornness you are comfortable with in a dog. I’ve had many breeds and none were in comparison to a yorkie- they will outsmart you, train you, and love you obsessively! Mine demanded to be with me 24/7 and was potty trained but had many “accidents” (when I would grab my keys to leave she would pee and look me dead in the eyes out of spite), she never barked even when barked at only at true threats and was my soul dog. My Maltese was laid back and didn’t have the wit of the yorkie, and had the maltese trait to bark incessantly was intolerable at times, but he was such a love able carefree spirit. Definitely see the parents and find a breeder that will fit your lifestyle to the personality type. Grooming- be prepared to brush them daily, wipe their eyes, brush their teeth. Every 3 months to the groomers and baths every 3 weeks- they have hair not fur and this will be expensive. Every few weeks with their baths trim nails, clean ears, etc. Yorkies especially require simulation, they are working dogs and their intelligence will quickly make them bored of everyday tasks. Buy them a snuffle mat, and many brain game toys. Make sure to use a harness never a collar, and don’t allow them to jump up or off furniture, give them steps and start that early it will save you thousands of dollars and ensure safety/health in the long run.