A rule I have established for myself is every watch I own must be a GADA, otherwise I just tire/get bored and end up flipping. I have a pretty popular GADA in the Rolex Sub. I'd say that falls more into the sportier side of GADA, though I have no issues wearing with a suit (think it looks pretty good, imo).
If I were to look for a 2nd watch to complement the Sub but still be a GADA, should I go for something that's dressier than the Sub, or sportier? I live in the Bay Area and work in a casual environment, so I only wear a suit maybe 10 times a year for various things.
IMO a GADA that would go towards the dressier side but still maintain GADA status would be something like a JLC Master Control. On the sportier end, I'd say maybe a sportier diver like the Omega PO would still qualify. But many others on either end of the Submariner in that spectrum.