Of all components on a bike, hubs might have the narrowest spectrum of performance from worst to best. Sure better ones are lighter and stronger and better bearings have lower friction, but the actual differences in performance are very slight, almost to the point of being unmeasurable.

Where there is a difference may be in service life, but even that hardly matters because worn out hubs are a rarity. In any case you would replace a working hub to improve service life, that would be counter productive.

If/when your wheels need replacing, then you have something to consider. Replace the wheels entirely with something better, rebuild on th same hubs, or buy "better" hubs, and build wheels on them. Until then enjoy the time you have with what you have.