Let's talk about our Red Rush strategy...

That's incorrect. What could prevent Red from attacking on the following day? It will attack without reinforcements on the first day of the week, which is actually significantly more advantageous.

Yes, I misspoke; I meant the first day and without new reinforcements.
In any case, the inability to attack on the first day with new reinforcements slows down the game. And often, on the second day, Red can no longer afford to attack.

Now, regarding the choice of Red.
I don't know about others, but I personally prefer Red because I like an aggressive playstyle. However, with this playstyle, Red actually has a harder time. Because the goal is to quickly find Blue, rush over, and defeat them.
This constantly involves setting up chains, and there isn't much focus on exploring and claiming open territories.
Blue has it easier in this regard – its task is to defend successfully and efficiently. While Red is rushing towards it, Blue can explore more, gather troops, and put up a defense.
In the late game, especially with both players controlling territory, it becomes very difficult for Red to win without a Recall spell. In such a late game, Blue is already far ahead.
And in this situation, the game can continue for another month of game time.