For parties, 1H is the best. For soloing 2H is best.
Levelling up both weapons will ask a lot of SP, so I would suggest to stick to the basic cleric skills to help your character, not cleric in parties because levelling up all the party buffs is a very huge amount of SP.
Take a ressurection skill (there is more than one, but take the first one) so that you are able to ress party members, take recovery division to compensate the HP pot delay and cast it on you when you grind solo (you need Faith to take and level up the skill), Holy Word is nice to cast on yourself too, and a quick healing spell for eventually healing yourself.
Good luck with the build.
