Others may disagree but IMO there is no such thing as a "beginners trike" Trikes vary by manufacturer, flight parameters, wings, engine, etc but none are marketed as a beginners aircraft. I did my training in an Airborne 912 with a Streak then Arrow wing and then went on to buy an Air Creation Tanarg.
It was within my budget and suited the type of flying I intended to persue - touring. So for what its worth you should make the decision as to which trike based on budget and intended use.