It is the wavelength of 1064nm that has proved to be successful in the treatment of onychomycosis. Studies across the board on different laser types all point to similar results of 70 -80% treatment success. The wavelength of 1064nm is used because it has little absorption in water and travels around 3mm into tissue with no tissue damage. As you start to get higher in wavelength, the absorption into water is higher meaning less depth penetration. The 1064nm depth is required to heat and pass the infrared light under the nail bed and kill the fungal colonies.
Basically, all 1064 nm lasers need to be as efficient as each other.
It comes down to price, portability, service and ease of use of the 1064nm laser unit you choose. ARC FOX 1064 is the top of the market on these points for onychomycosis treatment.