Whats the best dirt bike brand kawasaki, honda, yamaha, suzuki, or KTM? 2 stroke or 4 stroke?!?

im 5'3 5'4 150 lbs and im looking for a dirt bike....2 stroke or 4 stroke? and i want a fast bike that will last me and wont break down every 5 minutes.... WHATS THE BEST DIRT BIKE FOR ME!?!?!?!?!?!??!!??!
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