@Almondum : Essentially, I agree with
@Gargon667, but being a Combat-focused Woodelves player myself, I thought I'd just second the view that if you're also primarily a Combat player, you'll want to upgrade both MM and Needles as high as you can, and add (and level) the Shrooms and Flying Academy as well. That said, however, I would also mention that at my stage, and having fast-levelled the MM and NT, I'm now seeing very significant increases in Tourney and Spire Squad Sizes - to the point where I'm forced to Cater some Provinces above Round 20 or so even in Round 1 (!), even though I still have both MM and NT below Level 20 (Monastery at 18, Needles at 14). Because of this problem, and until I finally acquire the decent (i.e. above 1* level) Mercenary Camp Troops, I'm considering calling a halt to any further upgrades to either MM or NT, even though they are indeed very useful, since their Squad Size penalty is starting to outweigh their benefits due to the inferiority of my almost solely Barracks-sourced Troops.
I do keep both a GA and an MH, both reasonably high-levelled (GA at 14 and MH at 13), although I am growing more and more tempted to delete the MH, since I seem to have more than enough Goods to Cater the higher Tourney provinces (most of which I currently cannot fight, but which will of course become easier to fight once my Troops improve), even without the boost from the MH. There are only two reasons why I'm even keeping the MH; the first is (a) its Population boost, although I'm now finding that combining some of the
good (i.e. mainly 2+ years old) Event hybrids with a reduced number of Residences is a better and non-Squad-Size-affecting substitute, and the second is (b) the sheer number of KPs I've put into the MH, at quite a fast rate, because having wasted all those KPs will be annoying, to say the least... especially if AWs eventually become teleportable back into Inventory, since I think (?) this can be done in FoE - which Elvenar continues to imitate more and more all the time - and if I delete the MH now and then, within (say) a few months, it so happens that I could have teleported it instead, I will be, to put it politely, more than fed-up!
PS : I do know that, even if AWs become teleportable, they would certainly lose any KPs currently invested (in the active level prior to upgrade), and may or may not also lose any previously completed upgrades, but again, I don't think this happens in FoE, and if Elvenar can (to date) effectively copy and re-skin such large in-game elements as the Spire and Evolving Buildings, both of which originate in FoE, I don't see why AWs shouldn't follow suit - and if it should turn out that the MH becomes more useful at higher Chapter levels, I'd rather be able to (re)place it at Level 12/13 than start again at L.1!