Here you will find important aspects around the methodological advantages and disadvantages of panel surveys as well as about basic considerations when deciding for or against a panel design.
Pforr, K., & Schröder, J. (2016). Why Panel Surveys? GESIS Survey Guidelines. Mannheim, Germany: GESIS – Leibniz Institute for the Social Sciences. DOI: 10.15465/gesis-sg_en_008