For me its the matter of my rotator cuffs getting sore by doing flat benches, so I stick to inclines. I do my inclines on an adjustable bench on the lowest setting, so its not very steep and as close to a flat as it can be.
flat bench, pararell bar dips, and standing shoulder presses. im seeing people making excuses for doin inclines"my shoulders get more involved" i agree, so i cut out the incline bench and i do standing barbell presses instead.
I really think it is mostly genetics. Any type of pressing i do is usually flat, i haven't done incline for at least a year probably and i never do decline. My strongest part of my chest is the upper part, so IMO genetics.
I hate incline, Im too weak on it, incline db is ok but high rep my grip fails. Deep dips and flat bench are my favourites. db pullovers are a good finisher too