Well, would Drill IV Riflemen work out for you instead?
Works for me

Well, would Drill IV Riflemen work out for you instead?
It's a nightmare!
It depends how much we want to axe rush Asoka (one of the most peaceful guys in the game).
I think the cow and banana site (possibly with spices) looks better if we want a slow burn.
Asoka is really damn close to us. If we axe rush him, we'll have this whole area to ourselves and we can just REX it like mad. Anyways, this is supposed to be a war game! I need to learn how to war.
Sometimes, it is better not to attack immediately, but to let your enemy develop the land for you, and then when it is ripe, drive him from his own land, laughing the entire while.
In other words, why should we REX that land and have to develop it ourselves, when we can let Asoka do that and just... take it from him? He's not usually the type to field a particularly large military anyway, and if he does, we'll just field a larger, better one. We ARE Tokugawa after all. We field military well.
EDIT: Don't forget maintenance. Would you rather deal with the crushing maintenance costs now, or when the cities being made ours are pre-developed (and can be whipped besides)?
Yes, but other Capitals are always the best sites. Asoka's capital will have some basic infrastructure already. Also, there are not that many good sites available, without chopping lots of jungle.