Seconding JPack's post. Your MacBook Air came with a 30-watt Power Adapter. Any USB-C power adapter that supplies LESS than this will likely charge your computer slower than the original provided adapter. Any adapter supplying more than 30-watts will still charge your computer just fine. 98-watts is the maximum wattage supplied by your dock. Which is to say that it ought to charge and power a higher end 14-inch Apple Silicon MacBook Pro or any 16-inch Intel MacBook Pro (both of which come with a 96-watt power brick) at a comparable rate to the supplied brick, but might have trouble doing so with a 16-inch Apple Silicon MacBook Pro (all of which came with 140-watt power bricks). You can go with a higher-wattage brick than what came with your device, but going lower means that your device might sip power faster than it will optimally charge.
