It depends what you want, you want Physical or Rank? There's not really an optimal for both.
Physical requires fast kills, which usually net lower SP over time
Rank requires longer fights, which obviously nets slightly lower XP over time.
IMO you're better off grinding for rank as multiple classes will require SP but only one thing requires XP. I hope I'm typing this the way it sounds in my head and I'm not confusing you more.
MOB type and number depends on your class, for example a Maruader is pretty good at taking on 3-4 blue or green mobs at a time and sometimes 2 Yellow plus because of the large range of AoE. Pugilist however is a bit harder to take on more than 2 mobs at a time since most of the AoE are line based.
FFXI:Sylph - Perrin 75 Hume THF; Retired (At least from my use any way)
EVE Online:ScraperX; Retired
WAR:IronClaw- Peryn SW;SkullThrone- Grymloc BO; Retired