Ok, here we go.
For PUBLIC FREE PLAY there are 4 playlists:
Standard,
Advanced,
Competitive,
Old Skool.
Old Skool has: Public VoIP, FF On, Forced balance, “death spectator mode,” no rank restriction (?), and Commant Post buffs. It also does not have Overtime, so if you get a plant off with 20 seconds to go, but the plant takes 30 seconds to go off, it will not go for those 10 seconds extra.
Competitive DOES NOT HAVE “death spectator mode” or Command Post buffs, but is otherwise the same as Old School.
Advanced has everything enabled. FF on, Public VoIP, forced balance, death spectator mode, rank restrictions, command post buffs, and overtime.
Standard is Advanced with FF off and Public VoIP disabled.
I assume (though I cannot confirm or deny) that in PRIVATE Free Play, each of these options is configurable on its own.
As for the number of players:
Standard is 8-8 per team (8 min, 8 max);
Advanced is 8-8;
Competitive is 2-5;
Old Skool is 0-8 (meaning one team can be entirely bots, I guess)