Well I say--get the FE-2 I have a huge sentimental attachment to the FE-2 though. It was the first camera I purchased--in 1984, got her NIB. She held up well over the years shooting countless rolls color, B&W, and slides. Two years ago she finally died not the electronics or the shutter, but something in the film advance mechanism. I picked a new used one up of eBay for $120 or so.
But with all that said you can't go wrong with either the FE-2 or FM-2. I like having the option of Aperture Priority and the TTL flash metering really works well. In a previous post someone stated the shutter speed with out a battery defaulted to 1/90 which isn't true it's 1/250 same an the max flash sync.