For me, the "fits my eye" stuff is total nonsense. The putter I putted best with in my life was one of the ugliest. It was an old school Napa Northwestern putter with a lady golfer's name on the bottom. That thing allowed me to feel the ball like no other putter before or since. I remember trying to replace it with something that "fit my eye" and it produced disastrous results. I couldn't feel the ball at all. I've tried several Napa styled putters since and none of them had the feel of that old piece of crap you could get for a penny at a garage sale.
I guess I prefer blade putters over mallets due to being able to feel the ball better with a blade. A center shafted blade is the closest to my old trusty ugly putter. The Ashdon Bermuda Triangle and Macro Golf Blade were two of my favorites. (I also tried the Macro Mallet) I sold all of them over at FGI with countless other putters.
The longer I've been away from playing and when I think about the game and the time I spent over at FGI on equipment, the more I've come to believe that the shaft in the club is the most important thing and the head is almost irrelevant. That old putter I had that I loved probably had an L flex or a weaker flex in it than almost every other putter I've tried. Maybe, that's why I could feel the ball so much better with it vs. everything else? When I've screwed around and putted some balls with a regular flex hybrid I'm pretty good with it. I liked the feel so much from screwing around I bought a Putterwood putter. It's been sitting around for years untested on the greens but when I roll it in the house it doesn't feel like my hybrid and that's got to be due to shaft.