Maltodextrin or Glucose for fueling?

In general yes. If you want a simple formula that doesn’t require much thinking, then simply aiming to replace half of what you burn will always have you in a good place.

Sure, higher intensity burns more carbs. But that can’t be maintained for very long. And once you subtract out your onboard carb stores, eating half what you burn will put you in the right place.

For longer endurance work (3hrs+), you will be riding at an intensity that will utilize fat stores for anywhere around 50% of burned calories. So the eat half what you burn works here too. Your basically aiming to replenish your carb tank as you have 50k+ calories of fat onboard and will never run out of it.