Well, if angels are built, then our hero moves faster on the map. ;)
Maybe first, eliminate the guards of the artifacts to improve parameters, use fewer conscripts, and use wyverns... and do it everywhere without losses, while with horses, you can lose a horse or an archer.

And another question, why did griffins attack the "Pokémon"? There are fewer marksmen, and they deal less damage? And of course, griffins are guaranteed to suffer morale loss, so it's difficult to emerge from the third week with such parameters and troops intact.

I would still put angels on the 1st week - it's always better to have monsters of level 7, whether it's an angel or a dragon - for both speed and combat resilience (winning battles without losses). :)
The only problem is usually with finances - it's rare to be able to gather enough gold to buy them and then buy out the next wave.