Same keyboard manufacturer so i will assume they are structurally the same. From their its about the layout. You want more or less key is up to you. The keycaps between the two boards also seem to be different. TH80 is MDA and EK 68 is OEM/Cherry/"SA Like Profiel". So its basically personal preference. Its all up to you formfactor, keycaps, switches etc. We don't know what you like only you do.