We have seen a very calm tropical storm season to date, but in general, at this time of year (Sept-Feb), the South side is a better bet in terms of weather.
As RTB alluded, the geography and areas served by localized dive ops are hard to noodle out unless you have a real handle on the map and what it means in terms of available sites they can service.
I would guess that maybe 10% of Roatan's dive visitors stay with South side operations, all could be classed as AI. North and West Ops may publish that they offer South side access, but I would venture that statement is a stretch. Offering dives at (the overhyped) South side Roatan "signature dive" is about the extent of much of it.
Of that above South side 10% of the total visitors, that's the group that generally logs 20-27 dives in a week. The bulk of visiting divers to Roatan (that other maybe 90% of total visitors) access their diving at West End dive day dive ops, usually booking 7 to 12 dives during a week's stay. There is a large AI resort that blends into that area, Anthony Key Resort, and visitors there range in the 18-23 dives per week.
South side dive-centric resorts would be Barefoot Key, CoCoView and Reef House. Fantasy Island is rumored to be restarting business, but you might me an alpha tester where there has been some real issues in the past. Media Luna is a resort that also offers diving.
Most West End dive ops run North around the point and dive what are technically a North side sites, this is why I used the label of West/North when referring to this zone of dive sites. The only true North side dive ops are located 2/3 the way to the East, Turquoise Bay and Paya Bay, both are not really dive-specific resorts.
South side diving is best for divers who have perfected their buoyancy skills and have excellent close-in observational techniques. Many newer divers are disappointed in this area which is considered a macro paradise that is unique in the Caribbean.
The West/North diving is deeper and darker, but because of the Marina Reserva, divers will see the more common Caribbean fish in larger sizes.
Depends on what you want, what you're ready for.