Best dog for a first time-owner?

All those breeds, except for Boston terriers, need a lot of grooming.  Before selecting a breed, I would ask myself how much time do I really want to spend brushing my dog and bringing it to the groomer for baths and professional hair cuts.  After you factor in the time and money you may rethink your list.

None of the above. You're a teenager so 1) No breeder would EVER allow you to buy a puppy and 2) No way in Hell you could AFFORD a pedigree puppy much less TWO of them! 3) Pedigreed puppies usually only have some of their shots which means altering, the rest of shots is YOUR expense. You'll have another $400+ left over after buying a puppy?

When you're a bit older and have a job that allows you the LUXURY of having a pet then go to a shelter and ADOPT one.

I don't know why I waste my time, but I'll try again....

Dogs are not TOYS.  Dogs are not THINGS that you can drop and ignore.

Dogs are PEOPLE, with personality.  Personality trumps "breed."   Whatever "breed" is think you might want, will not always act like that breed is suppose do.

Get a adult dog, 2 to 6 years of age.  Get the dog from the Pound.  Get a mutt.

An adult dog will be somewhat trained.  Will be housebroken.

Dogs *NEED* people.  Full time.  I hope you will stay at home.

If you will go to work or school, who will be taking of the dog when you are away?

"Best dog for a first time-owner?"

https://www.google.com/search?q=Best+dog+for+a+fir...

Please DROP the idea of getting two puppies at once.  BAD IDEA; it will very likely lead to "litter mate syndrome" issues.  They will become overly bonded TO EACH other (will be IMPOSSIBLE TO SEPARATE - almost like conjoined twins) & neither will make you a loving or attentive pet.

I would suggest an EASIER TO TRAIN & more willing to please dog; either the Cavalier or the Boston Terrier.  The other 3 are independent or stubborn & REQUIRE a mentally strong, and confident owner, who can set the RULES.  However, ALL smushed faced dogs (aka brachycephalic breeds) are more prone to health related & over heating problems in warm or humid climates and may NOT be safe (in cargo) if you want to fly & take your pet.

While most of your choices are fairly inactive or laid-back; the Pom and the Scottie are NOT!!! They are SUPER ACTIVE INSIDE & Scotties are super active outside as well!  So you need to decide how active or inactive a dog - you need/want.  You also need to decide how much coat, shedding and grooming or costs for professional grooming you want to deal with.

So...do you even have $2000-$3000 for ONE purebred puppy? You do realize that's how much a purebred dog costs, right? And how first time owners, without proper dog-proofed homes, wouldn't even be looked at twice if you went to a rescue? Do you think these dogs just appear out of thin air? And you want two??? So you have $6000+ to spend on the dogs alone, is what you're telling us? Wow, must be nice. My rescue puppy cost $300 and he's a mutt and he's the best. 

Go to a shelter and get a dog that needs a home. Save your money if you want a small purebred, because you will not find one anywhere for cheap at all. Many people have purebred pipedreams, only to realize how much they actually cost. The base price in my area for an AKC'ed, papered, 100% purebred Boston is $4000. Good luck.

EDIT- What I'm saying is, there is NO WAY IN HELL you're going to find a purebred like the ones you mentioned to even adopt. Many purebreds get snapped up in a heartbeat and/OR go to a breed rescue. Breed rescues are notoriously picky about whom they place their animals with.