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On twins stock brakes are rather good. For short 10-15min sessions (which also imho are good to stick on, as for enthusiasts max attention/concentration level often drops off after that due physical & mental tiredness) on reasonable grip tires you should be ok with just better pads & fluid.
If you will be taxating brakes more, as in longer sessions, very grippy slick tires & heavy aero & thus higher speeds, installed forced induction and so on, then i'd think of ways to enhance braking, as in add brake air-ducts, upgrade to BBK and alike.
Though, while stock brakes are good enough for few trackdays in mostly daily driven vehicle, there might be few other good points for BBKs if you go to track very often. Such as often good BBK wearables (rotors & pads) might be of more common shape and of cheaper then eg. OEM spares. Often BBKs are also lighter, and reducing unsprung rotational weight is always good. From cons of BBKs might be worse wheel compatibility/clearance sometimes requiring using spacers or buying different sized wheels, also due lack of dust boots and due different metals in multi-piece rotors there might be more often issues with corrosion, especially in places where salt is thrown on roads during winters. More heat capacity may also mean that you may never get pads to working temps when simply daily driving, thus wearing off bedded layer, and thus squeaking brakes like idiot at each traffic lights stop.
To summarize, stock brakes are good and capable enough for short track sessions. You still need better pads (OE easy to overheat/glaze) & higher boiling temp brake fluid. If you so far have yet to track yours, i can advise also thinking of better performance alignment for more grip & better grip bias & more even tire contact patch & wear.
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