Love the non-adjustable TTO's.
Just an easy to use but still simple design.
TTO leaves a lot of room for models as well, British / US designs, Basic Superspeeds to Rhodium Masterpieces.
I had to take the TTO option even though I love my my Slim and Fatboy adjustables. The Engilsh rocket-type designs are spectacular performers and I covet some of these noble TTOs more than I do, say a toggle or a 195 bottom dial.
For me it's the Old Type. I also have a New and a SS Flair Tip. By far, I enjoy using the Old Type the most, and I can get some great shaves out of it.
I really like the TTO design. For me it works great (Red Tip, 40's SS). I have not tried any of the Gillette New's or Old's, but they look great also. My second pick would be the TTO adjustable's.