Electric fan???

I would say they both can work fine. The most important thing here is your radiator - so basically your radiator should be able to keep the car cool with no fan at all at a cruising speed, and only really need it at idle on a warm-ish day.

Also, a lot of the aftermarket electric fans are just crap to begin with, so I don't doubt a lot of you had issues. You want to use one adapted from an OEM application of some sort. There are a lot of good ones for different sized radiators, Ford Contour 2.5 V6 for a 26" rad or a Taurus 3.8L fan for a smaller one are usually good places to start. I have heard of HHR fans and some other ones that are decent as well.

In my case i have a 340, champion 26" 3-row, and the Ford Contour fans - and I only need the low speed. I'm also not losing 25 hp by running a fixed fan.

You will need a better alternator to run such a big fan, which would mean no factory Chrysler roundbacks or square-backs because they don't put out much at idle. I have a delco 12SI on my engine and it puts out about 55A at idle and it's only a 78A version.