Cuban · Bacardi
Bacardi started in Santiago de Cuba in 1862, and the mojito is a Cuban drink, so this pairing is not marketing. Superior is filtered through charcoal and aged briefly, which leaves it light and clean.

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The one thing that matters
A mojito needs a rum that stays out of the way of mint and lime. Anything heavy or heavily aged will bully them. Light white rum is the correct choice, not the cheap one.
A light white rum. The drink is built on mint and lime, and a heavy aged rum will bury both. Bacardi Superior is the traditional Cuban choice and it is genuinely right, not just cheap.
Simple syrup dissolves instantly and is more reliable. Granulated sugar works and helps grind the mint slightly as you press, but it can leave grit at the bottom.