For tactile pleasure, I'd choose my Robert Wade straight, made around 1815, as I get a buzz out of the history aspect of shaving with older implements but as this is the DE forum and my straight shaving skills are far from honed (see what I did there? ), I think I would choose my R41 for the closest shave and a Gillette Slim for comfort and coolness. I've used Slims more than any other type of razor since I started with DEs 4 years ago so I'm more familiar with them. Also, I'm a big child so the fact I have a 1964 Slim makes me feel like James Bond when I'm shaving (it's also why I hope I'll enjoy the L-type Schick Injector that's on it's way to me from Canada right now).
No shave. I would not dare to use any of my razors as my wife (who is both a medical doctor and exceptionally cunning) would have smeared all my Feather blades with deadly poison - and I probably would be so excited that I would cut myself, even with my AS-D2...
Just one? I'd do first two passes with GEM Micromatic Open Comb (ATT SE1 a close second-ran). Next two with Wolfman OC .74 (Timelss .95 also-ran here) Clean up sideways around the Adam's Apple with a Schick Type E .. then touch up after a rinse with ..
Of course by then I'd probably expired due to old age ..