What's easier? I learn to control a 12 meter ski in skiing fast and stable? Or I learn to make 16 meter ski to make tight curve?Assuming they haven't put me on very stiff skis but on beginner/intermediate-appropriate skis, I imagine the 12m radius ski will have me turn quite quickly, but may feel a bit squirrely/unstable going faster in a straight line, in bigger turns or at higher speeds. The 16m radius ski will give me more control and stability overall, but takes away some of the agility in very short turns. Which I might make in terms of meters, but not necessarily in terms of high frequency.
For overall skiing (i.e. not specialized in very short turns) I would go for the 15-16 m radius ski, assuming that you're trying to get me on a Salomon S/Max 8 (R16@175) and not a Head Worldcup Rebels e-Race Pro (R15.8@175).
Like I said earlier: Radius is just one factor, and in this scenario/ability level not the most important one, IMO
For when I become advanced skier.