Over the past year, the price of Brent Crude, a key global oil benchmark, has been as low as $70.31 and as high as $93.12. Over the past three years, the swing from peak to trough was even greater, with the low at $69.53 and the high at a whopping $133.18. Talk about a roller-coaster ride! This is why the smartest oil stock for most investors right now will be reliable industry giant Chevron (CVX 0.45%).Some key reasons to like ChevronBefore getting into Chevron's business, it is worth looking at one of the ...