I tested this a lot to see, but coldfront is largely ineffective as a farming tool now, and not great until you have maxed ball
You farm slightly faster, but not meaningfully faster with CF vs
SH
Neither farms significantly faster than the laning stage items, and Torment Pulse is really your power spike
So when it comes down to it, you are going to delay Torment Pulse only if slowing hex will help you deal with a problematic enemy, which it can a lot
The reduced dash distance + movement disable is really strong in to a lot of current meta heroes
CF has a movement slow attached, but since it doesn't disable movement abilities, it's less valuable.