Guild Wars 2

so what is actually the best sigil combo? sigil of air and sigil of fire together seems better than sigil of force and sigil of accuracy/night…

opinions?

Night/slaying or slaying/force.

Depends.
Dungeons? World Bosses? General Open World? WvW? PvP?

Dungeons: what maha.7902 said
World Bosses: force + bloodlust
Open world: air + fire or bloodlust + fire (you’ll be fighting groups of mobs often so the AoE of the fire sigil is better than the air sigil)
WvW and PvP: it will depend a lot of your class and role there.