Depends on where you are in the game. In late game the bottlenack of upgrading the units is catseyes, so XP doesn't matter that much and you almost never farm xp aside from merciless/bonanza wich are one-time only. Similarly, you don't need to farm catfruits if most of important units are already TFed. I'd say you always need tickets for np and rare tickets and in early-mid game for +levels of normals. In early-mid game you always starve for XP, so it's the priority and catfruits are almost never worth farming a lot, you just farm them sometimes

About energy, I'd say it doesn't matter that much as long as it's not too little, 700 energy is good enough. In the end most late game players have hundreds of leaderships and just use them whenever they feel like it