Open dump is the worse, sanitary landfill is the best but impossible for developing countries so managed landfill is appropriate both technical and finance.
it depends on a big number of factors, such as topography, groundwater, soil type, etc, etc, etc and of course also the amount of resources available.
Some good literature:
Zhao Youcai and Lou Ziyang (Auth.) Pollution Control and Resource Recovery. Municipal Solid Wastes at Landfill [1st Edition] 9780128119013, 9780128118672 Butterworth-Heinemann 2016,
Timothy G. Townsend, Jon Powell, Pradeep Jain, Qiyong Xu, Thabet Tolaymat, Debra Reinhart (auth.) Waste Management Principles and Practice Sustainable Practices for Landfill Design and Operation [1 ed.] 978-1-4939-2661-9, 978-1-4939-2662-6 Springer-Verlag New York 2015
K. Westlake (Auth.) Landfill Waste Pollution and Control 978-1-898563-08-2 Woodhead Publishing 1995