Difficult to say. I have F104 and spent a lot of effort and money to get it run right.
It's good now, but seems F103 have more tyre options, and other C-Hing F103 (some with GT option and tyres) run really well. F104 foam tyres currently seem expensive.
Perhaps get the new F104 W (F104 Pro with Wide track and uses 103 tyres . .. . ).
