one of the important points
and to add my own experience, i've been riding both scooters (gilera/mz moskito 125/etc) and 100cc-150cc mopeds (y15/rs150/ex5), its difference is quite obvious when cornering, due to difference of tyres used

Having reduced gyroscopic effect means smaller wheels are great for maneuvering thru urban traffic. Trade-off is that they might get twitchy at very high speeds & they can't really deal with road imperfections & obstacles.

Bigger wheels will deal with surface imperfections & obstacles better, making them great for off-road capable bikes. Trade off is that they're not as easy to wing thru dense traffic & can feel a little disconnected at high speeds.

The industry has decided that 16"-17" wheels seem to be a good compromise between the two.

that one Marc Marquez MM93 pun tak sampai oh 
if you count those crash saves with a leg in the air bike totally scraping the track ady, i think he gotten 70 or 71 la... lol.

yes start from 0.

30ish degrees can drag knees already
(i am that bohlanpa knee dragger lol)

i got both scooter  and sportbike

scooter  nmax
-150cc/ with tire 13inch rim, 110/70 front and 130/70 back

sporbike r25
- 250cc with tire 17inch rim, 120/70 front and 140/60 back

- tried corning at ulu yam/genting, karak/bukit frazer with my scooter  , its good feeling, but you need to find good tire and suspension. then u can layan corner like pro. but the problem with skuter is the low clearance, so when you corner at max angle, ur tongkat/eksos might drag on tar road, which is not ideal. luckily after i change to other tire shape like Pirelli angel GT, its non issue for me anymore.

for r25, because it hv 17inch rim, high clearance, can corner more angle because its design for it.

as for the suspension, scooter  normally at the back hv double absorber, short fork infront.
compare to normal sportbike hv mono suspension with USD fork.. these suspension also play important part when cornering. 

plus 17Inch is better when u go rough road, pothole etc, that why most of the adventure or offroad bike hv bigger wheel. like 19, even 21inch.