Staff vs Scepter/Focus
Scepter is a good burst wep but sucks at sustained dps. Its common to use Fresh Air and maximize the number of electric discharge procs to try and overcome this shortcoming. If you don’t like that then you should prolly stick to staff.
I don’t see how S/F can do better offensive than staff in open world. Staff does absolutely monstrous damage with meteor + lava font + fireball if you can set it up. With it’s range and multiple kiting abilities, those setups are also far easier to do compared to S/F.
Unfortunately nobody can tell you which weapons are right one for you, they are all viable. You need to pick your weapons and we can recommend good builds and gearing options based on those weapons.
Personally I will never go back to scepter or dagger, staff is just way too useful especially on big bosses where most of the meteors hit.