Trusts cannot retain income (without trustee paying top tax rate) so with either structure you would have the same issues - may need to retain income in a company at some point. same problems - how to get at that money.
TherThere may be a few reasons
1. Licensing. E.g incorporated legal practice in now.
2. More than 1 family involved
3. Ability to bring I outsiders later. Hard to sell 20% of a discretionary trust but easy to sell shares.
What about wages?
If people are working for a trust as a business and not drawing any wages this is underremunation and has asset protection consequences. There may also be tax issues.
What changes occured in 09?