  Uncrewed Aerial Vehicle (UAV) research faces challenges with safety,
scalability, costs, and ecological impact when conducting hardware testing.
High-fidelity simulators offer a vital solution by replicating real-world
conditions to enable the development and evaluation of novel perception and
control algorithms. However, the large number of available simulators poses a
significant challenge for researchers to determine which simulator best suits
their specific use-case, based on each simulator's limitations and
customization readiness. In this paper we present an overview of 44 UAV
simulators, including in-depth, systematic comparisons for 14 of the
simulators. Additionally, we present a set of decision factors for selection of
simulators, aiming to enhance the efficiency and safety of research endeavors.
