Interesting thread! I own the following transformers in descending order of what I consider to be aesthetic appeal:
1) Type V (the deco face plate evokes “Flash Gordon”)
2) Type T & No.95 Rheostat (steampunk)
3) Type TW (sleek and utilitarian)
4) Type KW (the “throttles”, while counterintuitive, are cool)
5) American Flyer #4b (a box with a knob)
6) MTH Z-1000 (modern; lacks the gravitas of the old-school stuff)
I like the “heft” of the pre- and postwar transformers. I’d love to own a mint condition LW and you can’t beat the look of the Flyer 18b and 30b.