I don't know really.
I think Lukaku scores more goals, which suggests he's the better finisher, but he often looks like it's hard work or he's mis-controlled it into the net.
TBH when Lukaku was here I would still have rather seen Mirallas through on a 1-on-1 with the keeper as I felt more confident in him finding the net.
Lukaku would really bottle it sometimes.
One of the best finishers I've ever seen for us was Trevor Steven. A few volleys here and there and the odd header but mostly - calm passes into the empty space between the keeper and the goalpost. Beautiful to watch. Or is that my Blue-Rose-tinted glasses...... #GettingOld