For everything drama related i nowadays prefer serialized and even the now common binge formart of between 10-12 episodes as it cuts out filler episodes and concentrates the episodes while still giving enough room for character and story development ( if well written).
Speaking of this, we had a locally developed drama that aired over 8-10 episodes per season with 4 seasons, but it was a half-hour show. Because of this, I never felt it left enough room for character development as it was always over before anything interesting could develop. It was also an episodic show with a light story arc. The format always drove me nuts for a drama, but I suspect it due to was due budgetary reasons as they were limited in how they could do with their funding.