On #2;
If you can brake later (good braking), you carry more speed into the corner.
If you can accelerate sooner (good acceleration), you gain more speed exiting.
If you can accelerate sooner (good acceleration), you gain more speed exiting.
I believe good acceleration out of the corner apex is overall faster, as you carry all that extra speed down the next straight. You take different racing lines as well (with that approach), taking an earlier corner apex, than the mid radius point.
A certain Michael Schumacher put massive emphasis on this :-)
Also to add: the overall handling and grip (mechanical for more low speed corners, downforce for more high speed corners) are also very important factors for the overall lap time.
The higher your average speed (especially your lowest speed) in the corner phase, can gain you a lot of lap time. Different ways to achieve this, especially on the drivers side. On my side, I do the Ayrton Senna quick throttle taps, mid corner, for my sim racing (with early 2000s F1 cars) Takes some getting used to, but gained about -1.00s/lap. Ted Meat, the YouTube sim racer does this technique as well.
The real challenge I think is to do Senna's technique with the 1980s turbo F1 cars (no traction control) Easier to do with early 2000s F1 cars with traction control.




