Siamese, Maine Coin or Scottish fold?

Personal decision.  I'm betting you've never even seen a single one of these breeds in person so why would you choose a cat based on pics/videos on the internet that likely aren't even these breeds?  Go to a shelter and ADOPT whatever cat chooses you.

They're all terrible. Try a reptile, bird, rabbit, guinea pigs, dog, ferrets, or rats instead.

I would not recommend a Siamese: they are very noisy, meow a lot, and tend to make a mess poking around.  Scottish Fold is okay.  They're not much different than tabbies.  The Maine Cooon is good: very gentle and affectionate.  (I had to misspell it, because "Cooon" would have been "edited.")  But, if you get that one, be warned: they are HUGE cats that take four years to reach full size, and they do require a little more grooming.  I suggest you go to Animalplanet.com, and watch "Cats 101," to get more information.  Animal Planet always warns, "Do your homework!" and know what you're getting into.

i think they would all make good pets