Hi Winny!
If you drive sensibly and carefully in either weather condition then you should have no problems. Most modern cars have traction control systems, some even with winter settings, and stability systems to help the driver cope in adverse conditions. What you're asking is the basic difference between understeer and oversteer;
A front wheel drive Volvo will understeer (plough on towards the outside edge of a corner, lose speed) if you overstep it's limits. The BMW however, over it's limits, will seemingly behave in the opposite way, pitching toward the inside of the corner. Over compensation of this oversteer may lead to snap oversteer in the other direction, and can quickly get out of hand, especially if the driver is heavy footed and/or not quick with the helm. An experienced driver will know how to control this, a novice may end up in a hedge.
The simple answer is don't drive the BMW it near its limits in any weather, just gently and smoothly accelerate in corners, where applicable, and the car will settle into a neutral stance, it'll be fine, and, as your confidence grows, enjoyable.
Good luck!