Ekahau is my tool of choice with regards designing and validating an installation. The spec an integration is also a big plus. Aircheck fits into the middle of that and allows you to quickly test a pre-defined set of parameters with just one click of a button. It also has some pretty neat displays regards certain metrics like bandwidth utilisation and wifi vs non wifi 'noise'.
What i would say is, work out what you want from the tool and then make your decision.