If you are able to get some nice deals in place and you’ll have peace for the whole Conquest, it would probably be best to invest in tower costs + built speed.
If you have to fight a lot, energy + defensive + offensive techs would be advisable.
Movement techs are always useful no matter what.
In the end, since the wisdom costs are so high, for the vast majority of alliances (99,9%) it won’t matter too much. You’ll just end up researching 5 or 6 techs only. You needed some serious gem invesment to go further than that.
Lets see how the new system goes. It looks like things might change a bit.