With respect to share trading, the benefit of using a trust structure lies not in the protection offered but in the flexibility when it comes to profit distribution, capital gains and franking credit allocation.
Note there a number of trust structures, most common is the discretionary trust.
Most family trusts are set up as a discretionary trust.
Basically it's up to the trustee of the trust as to how and to whom profits are allocated. Tax is then paid by the Individual or Entity that received the distribution, at their given tax rate.
If used correctly genuine tax savings can be achieved.
Bearing in mind , this kind of structure is not for everyone,
the pros and cons must be evaluated on a case by case basis.
You should really consult an Accountant/ Registered tax agent, to see if a trust structure can benefit you.