[Physics] Which fundamental reversible thermodynamic process has maximum work associated with it

Question

By fundamental I mean isothermal, adiabatic, or isobaric.
My book says that in expansion the maximum work is associated with isothermal process. But if I observe the PV graph, I feel like the isobaric work done is maximum, since it has more area under its curve.
Does it depend whether ΔV is constant or the supply of heat is constant.
Also does it matter if the system is being compressed or expanded, A theoritical reasoning might be better than just a numerical example.

Answer 1

Maximum amount of work is indeed obtained in isobaric process but it is not reversible.