I missed this thread 1st time around, but clearly it is better and more intuitive to use IAS. Collective then controls height, which is intuitive, missed approach just requires the collective to be raised. However I suggest it also depends on the desired speed. If it is anywhere near Vy then definitely IAS. However if it is at the high end of the speed range, then VS /ALT Acquire. This correlates with the need to manually control height with collective at low to medium speed, (medium-high if you like), but the absolute necessity to control height with cyclic at or near Vh.