There are so many personal preferences involved that it's impossible to give a solid answer to that. Might as well ask what's the best candy.
santa cruz
You cant rally get any good moutain bike for that price but for that price i would recomend a giant. Also it comes down to wat u want it for like downhill, hardtail, racing, etc but if you expand your price range you could get a specilized they are like the best bikes ever made so good luck finding one!
yes, I have one and it is a 21 speed blue hardtail 15.5" marked with team fuze.
There are several good brands out there, which is "best" is a matter of personal preference.There's so much of personal preference in what's the "best bike" to make that a pointless question. You might as well ask about the best band, the best snack or the best whatever.
the best bike is a handicap bike
If you know how to weld and cut steel - sure. Otherwise - no.
a mountain bike a camera
SGM...
no a lawnmower engine is too big try a weedwaker engine
norco
It's not possible to agree on one "best" make of mountain bikes, it's too influenced by personal opinion. You might as well try to agree on the best pizza, band or color. There are several "good" makes though, Trek and Kona for instance usually build solid bikes.
One of George carlin's.adages was "I hope your parents never buy you a car." A life lesson in responsibility and self sustainability. Maybe you could ask yourself, "How can I make myself get a mountain bike." Oodiespruce