For me it is my 2011 R41. It is my favourite razor. I never found a Gillette DE that could deliver the BBS for me, all my favourite DE razors are modern except for my Barbasol floating head. It is out getting replaced.
All my DE razors are Gillette. I would like to try a phoenix. That's probably going to be my next safety razor.
I purchased a Muhle R89 about three weeks ago and it's now my go-to razor. Before that I used a Merkur 34C almost exclusively.
I went through a phase buying vintage Gillettes. I like my little collection but I too get the best shaves from my modern razors. With $0.75 CDN to the US $1.00 I can't afford them anyway.
My favorite non-Gillette safety razors: Weber DLC Edwin Jagger DE89 ER 1924 SE "shovelhead" Cadet OC Merkur 34C Heavy Duty Star 3 piece tech
My favorite non Gillette razor is the Edwin Jagger DE89. Great close shaves and pretty too! Just don't drop it.
I bought one of those DE Razors which that "Pawn-Fella" advertised. Not a bad razor, at all; for the price. It's the only modern-day razor I have. The rest are 50 years, & older!
It would have to be my daily driver: Merkur 34C, but a close 2nd is my EJ DE89L. Other than using my Schick adjustable occasionally, they are the only razors I use anymore.
I would have to say my Rotbart Mond Extra raised flat bottom open comb razor is my favorite non-Gillette. It was a pre WWII model.