Traditionally you will find Japanese swords were more often around the 8mm mark, but with a good heat treatment it is feasible to have a somewhat thinner one made without sacrificing much strength. Thickness itself is not a very comprehensive measurement of what a sword will/will not be able to do, nor will it dictate handling characteristics.
If you want something more traditional or beefier for cutting, you would likely be better off with 8mm. If you would prefer something for iai kata that can still cut, 8mm will still work if the sword is shaped adequately, but 6mm might be a safer bet.
Just depends on what you want Good swords can be made in either thickness.
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