If the company buys something on credit and no personal guarantees are given and the company doesn't pay for the goods then only the company can be sued.
in this scenario, Mike Smith is the sole owner of the company MS PTY LTD
Is he more protected than if he were a sole trader ?
In a one man show, is being a company / sole trader much different I guess is the question ?
Yes, the shareholder is totally protected.
It is like owning Telstra shares - if the company telstra is sued or goes under the shareholders can't be held liable in any way.
In this case Mike Smith as director will be safe too. He could, as director, just decide not to pay the bills. The creditor could then sue the company, but not the director. He could let the company go into liquidation and come out relatively pain free. He may have a slight blemish on his craa as it may show he was a director of XYZ Pty Ltd and futher searching could reveal the liquidation.
But this is way better than being a sole trader. A sole trader would be sued and all their personal assets will be at risk.