Whether or not it's a better sound is a matter of taste.
On any multiple-pickup guitar, the bridge pickup will, all else being equal, sound quiet and skewed towards high frequencies compared to the others. Designers have traditionally gotten around that by adding more windings to bridge pickups, tilting them gently towards lower frequencies, and increasing the overall output.
Replacing the bridge pickup with a hotter design is a little more drastic approach to the matter. The fact that there's no tone control for the bridge pickup on a strat is some extra incentive for doing this, as it's always going to be set for full blast shrillness, and a lot of players will find a humbucker's more laid back tone to be easier to work with given that limitation.
The tradeoff for this is that, with 3 single-coil pickups, you could use switch setting #2 or #4 and get hum cancellation. When you replace the bridge pickup with a humbucker, the bridge pickup will no longer hum, but it loses the ability to cancel the middle pickup's hum, so switch position #5 gets quieter and #4 gets noisier.
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