They are both used to evaluate liver damage. They both allow doctors to visualize, and quantify the stiffness of liver tissue.
Fibroscan uses a transducer, connected to a ultrasound. It bounces sound waves off different areas of the liver. It measures stiffness, and produces a US scan of at least 12 sections of the liver.
Aixplorer uses Shear wave elastography(SWE) It generates and computes wave velocity, that displays liver tissue elasticity, along with US scans.
I cant tell you which is better, so I checked a few websites for comparison. my search leaves me thinking that SWE gives much better quality scans.
Mayo clinic has developed the magnetic resonance elastography(MRE). it combines mri images with sound waves to detect liver tissue stiffness.
I remember when hep c treatment became more successful. Doctors wouldn't use invasive biopsy, to check for regeneration. Fibroscan became the go to procedure to detect improvement.