Is TINA-TI as good as PSpice for simulating RF?
The spice language is the same, the solvers are not the same. It goes like this

Graphic or text-> SPICE netlist -> Circuit matrix -> Numerical solver

The circuit matrix and numerical solver make a huge difference. Some are proprietary. The solver has to find the DC operating point for initial conditions and then start a transient simulation. (if you don't find the initial conditions, you'd have to wait for the system to converge, if it has large time constants it wastes time. Or sometimes it might never converge if the system has local convergence). Here is a great article on how all this works.

I prefer LT spice. Why? Because its free and used internally by Linear, that means it has all the features an engineer could want. Check out this article on numerical solvers and LT spice.

I would also go with the spice program you teacher uses, they have to check it and that takes time.