Should I stick with my level 3 cathedrals until I have enough to make a lvl 3 sub? Or can I switch them out 1 by 1 without hurting my plunder tl:dr - which has more plunder
Do a cathedral - raises max plunder more than Lvl 1 anything, and gives more stats And soldiers - only upgrade to tier 3 if you can at least get Lvl 2
Don't buy T3 unless you can upgrade to lvl 3, because otherwise the plunder is better with a lvl 3 T2. Anyone who says more troops means more money is a noob...
If you are going with cathedrals and not forges, then convert to summoning circle. You keep the extra plunder bonus.
No matter how many soldiers u have, u still only get 24-26 hits (on an osf) so not necessarily more gold