Just to add some points, (no pun intended!)
The difference between small, medium and large streamline points are;
Small, 185mm long 12 degree crossing angle 610mm radius
Medium 219mm long 12 degree crossing angle 914mm radius
Large 256mm long 12 degree crossing angle 1524 radius
The small radius point is good in small layouts but as Noel says its not very prototypical looking. The long points look great but they take up a lot of space.
All streamline points automatically give the same double track spacing, its 50mm centre to centre which is a scale 6' apart between sleepers. Set track points give a track spacing of 67mm. This is better for layouts in small spaces with tight radius. At 50mm apart rolling stock will collide in the curves if the radius is too tight.
Curved points are the same 12 degree crossing angle and 50mm spacing. But they are only available in one size with an outside radius of 1524mm and inside 762mm.
A common misconception with electrofrog points is that people think that they need to be modified to work on DCC and you need to fit an auxiliary switch to switch the polarity. This is not necessary, electrofrog points work straight out of the box, you just need to fit insulated rail joiners on the vee. The point blades switch the polarity.
The only advantage to modifying the point is when you paint and weather the track. It can also prevent short circuits with older rolling stock with big flanges.
Hope this answers your questions.