The best goat depends on your needs..if quiet is your need then I would have to say Saanen...they are very quiet and docile but the larges dairy goats breed..and only come in white lol
Nubian are the loudest by far lol...but I love my girls...
Lamancha are pretty quiet, come in lots of color but some dont like the tiny ear thing ( they are my favorite breed).
Oberhalsi seem to be quiet, docile and come reddish brown with black markings...
Alpine seem a bit high strung, but that from reading about them not personal experiance
when you are ready to get goats..read up on each breed and find one what fits your needs and location and space...I love Lamancha but they dont sell well in my area, Saanen sell like hot cakes and Nubian sell well too...so I have a bit of all three..
if you are limitedon space but wants more than a few..then Nigerians are great..they are cute..come in tons of colors and take up less space, but they are short and need a table make for htem for milking...so lots to consider befire you decide : ) but lots to choose from too...