Yow! The Thread that Shall Not Die. IMO, Moody's were the best leather strap, period. El Dorado are ridiculously stiff --not supple at all -- though visually very nice. I've had virtually all the others names here, and they're all fine. Moody straps are the only ones that seemed a notch above, to me. For the last few years, I've gotten away from leather straps and have found some really excellent straps at Jaycko. Read about them via Nels Cline, who is always right!
A wide leather strap with either a) a smooth back, for movability and not bunching up your shirt, or b) a suede-ish back, esp if your guitar is neck-heavy. Brand and details are up to you. I use these Takamine straps they gave away in 2015: