Clicking or not is only matter of proper servicing Your hubs. Auto mode of standard Nissan hubs is very useful and wise solution until You know how to live with it.
Make easy service: open hubs, accurately clean with gasoline getting all old fet/grease out of it, dry it properly and after that put just a bit of Nissan Part Symbol KRC19-00025 grease. DO NOT overdose!!! Overdosing is 99% reason of improperly working hubs.

And then just to remember: always lock them when You plan driving off-road. Even on black hubs might be locked when You shift to H2. The only difference is Your front axles will rotate free making some slide discomfort at high speeds.