It’s not quite that simple...
Your iPad Pro 10.5” supports USB PD (Power Delivery) Fast Charging. When your iPad is connected to a PD-compliant Power Adapter, the iPad can charge at its maximum supported 18W charging rate (2.0A@9V or 1.5A@12V). Using a USB PD Power Adapter with a higher power rating will serve no useful benefit, but will do no harm; a normally functioning iPad will not draw more power than it is capable of using to safely charge its battery.
When using a standard USB Power Adapter, the iPad will only charge at 12W maximum rate (2.4A@5V).
Not all Power Adapters are USB PD-compliant. Some use a different standard - “QC” (Quick Charge). Apple devices do not support the QC Standard.
Popular choices of Power Adapters for charging your iPad Pro 10.5 are the 30W or 20W Apple Power Adapters. Both these and other Apple Power Adapters are perfectly suitable for your iPad. As previously outlined, higher wattage Power Adapters serve no benefit to your iPad - but may be useful if you have other devices that can derive benefit from a higher powered device.
For example, I routinely use a mophie PowerStation 3XL when away from my home office to power/recharge my iPad. I use an Apple 30W Power Adapter to Fast Charge my iPad from AC Power, but also use this Power Adapter to Fast charge the PowerStation which can accept the full output from the Power Adapter.