Great feedback - thanks.
My needs are more focused on cold crashing than maintaining ferm temps. I now see this argues even more for the chilling coil because the coil is faster and I wouldn't need to put up with drippy chiller hoses for more than a day at a time. The short duration of a crash also makes using an ice water reservoir more palatable (vs a glycol chiller) because it should only need to be filled with ice once. Who knows, I might decide on a glycol chiller eventually, but there's a chance the ice is convenient enough. (to be clear, I'm talking about pumping ice water from the reservoir through the chiller coil)