Waving flags... animation or apex cloth?

Hey guys,
I’m wondering if a waving flag should be done animated or just with apex clothing ? My goal is to get a nice looking wind effect.

if there is no interaction between cloth and objects there is no point in wasting processing power. you can use world position offset node in material editor to create wavy effect

I agree. You may fake the wind using your material world position offset as Piroman said. There is no need to rig anything or use cloth systems.