There exist several configurations of airborne electromagnetics (AEM) systems. For example, one may have transmitter and receiver fixed or towed, coaxial or separated, attached to helicopter or airplane. Moreover, the system may collect data in time domain, frequency domain or both. Each system has its benefits and drawbacks: towed ones are less influenced by primary field due to large distance between transmitter and receiver than those with fixed geometry, and time domain data is usually believed to be better suited for deep objects exploration, while frequency domain data are mostly concerned with near-surface region. This paper is devoted to comparison of three system configuration. Namely, EM4H has four frequencies and can be either towed by a helicopter or a fixed wing aircraft, and EQUATOR collects data both in time- and in frequency domain and can only be towed by a helicopter. All three configurations have been tested on one profile, and the comparison of inversion results is given.