In games where you are trying to extend resources due to a high number of encounters (6-8 encounter adventuring day which is suggested by sourcebooks), I believe you are going to squeeze more value out of res con or war caster. As an example, using Spirit Guardians on a cleric which has 10 minutes could be used for multiple encounters in lets say a dungeon. Dropping concentration on it can limit your ability to chain encounters. These scenarios are rare at most tables but they are deadly when they happen.
If you are making use of the additional effects of war caster (the AOO effect for builds such as ghostlance, the full hands casting one for most paladins and bladelocks), it’s going to be priority over lucky as it is build defining.
Lucky has a lot of versatility which is good at tables that are taking a lot of rests and are doing a variety of things outside of dungeoneering.