Winch.
There may be a few instances where a long line would do fine, but given the choice definitely a winch.
In reality, the rescuers have to find you first. You might not be healthy enough to help them much. With a winch, the time from target sighted to rescue completed is about 3-5 minutes (plus time required on scene for medical) for a trained crew doing it very carefully. With a long line, I expect the time for the sequence to be similiar, but you have to add two way transit to the nearest area to set up for the rescue.
From a safety standpoint, neither is a good place to be, but if needed there are more options available when your load is on a winch than on a long line.
Of course, my choice is made assuming all other factors are equal. If I was rock climbing near Banff, I'd prefer to be rescued by Alpine's long line than my squadron's rescue hoist.