FALA
I used both airports, but our operation now prefers Lanseria and I'm happy about it.
The runway renovation project has been completed recently and RWY 07/25 shows now a width of 45m/148ft and useable length of 9829ft.
Keep in mind that there are two VOR-Approaches and a RNAV(GNSS) to RWY 07, but with different Minima depending on Missed Apch Climb Gradient.
Execujet Handling always works fine and due to the smaller size of the airport you get through Customs/Immigration/Security way faster.
Montecasino or Sandton are both fine, just a matter of personal preference.
InterContinental or Hotel Michelangelo (if your budget permits) in Sandton are my favourites.
Cheers,
threesixty