My personal priorities are as follows: Therefore, all level 7 infantry units take a step back... they will bring less benefit to the game than flying units. Next comes the unit's speed - THIS IS VERY IMPORTANT!!! If I'm not mistaken, the top 3 in this regard are Phoenix, Archangel, and Archdevil, and the first one seems to be the fastest in this regard. Attack and defense stats are approximately the same, and each unit has its own advantages. However, the weekly growth rate is what really matters and puts a significant emphasis on choosing the best of these three. Phoenixes have the potential to always be twice as numerous as other level 7 units, plus creating level 7 units is usually much faster than in some other castles. That's why I consider Phoenix to be the most promising