Which is the best decision for my long term career?

Hi everyone, I am a guy of 25 years. Since July I started an internship at PwC, in line of service risk assurance. What we are dealing with in most of the time is audit support. That is, we perform testing on the system of internal control of the customers. These controls are ITGC (IT environments), or controls that have an impact on financial reporting (quadrature between different documents).
The working environment is really nice and I think also to have been appreciated by the senior with whom I worked. My problem is that the tasks that I do aren't what I expected. I have a master degree in economics and finance and I wanted to do things more quantitative..such as financial modeling, forecasting, montecarlo simulations, pricing etc. All things that on paper I should do in PwC but in practice I realized I will never do. This worries me because I so afraid of being pigeonholed in internal control...because in 2-3 years I'll become senior, but I'll be senior only in the evaluation of controlls..that it's not precisely what I want.
A few days ago I was contacted by a consulting firm that has asked me to send a cv..for a vancancy in enterprise risk mgmt..function where among other things they do just what I would to do. Given that I will send it surely..now I'm truly undecided, should I leave after a few months PwC, company who may not do exactly what I want, but where I feel good and that neverthless, will bring me experience (I already know that I'll be confirmed in January when I'll have a two-year contract), or should I throw myself on the other? That in my country (Italy) is practically a leader in quantitative finance offered to financial institutions? But clearly, however, it haven't the name of PwC and where I cannot know how the enviroment is..