[Nonfractal]

Riko,
Lots of factors to consider when selecting motor orientation

1 the rules
Most clubs restricted formats for classes 
You may not be permitted to use the orie station you prefer 

Some clubs permit all formats but restrict the motor that can be used in each. 
Eg, inlineand sidewinder  unrestricted, anglewinder 22k rpm 220gcm max.
For me a king 30 inline will always be better than a flat six angle winder.

2. The motor
If you have free choice, inline can handle huge power but the formats where the motor is parallel to the axle , the torque can trigger power deslot off the start line which then might require you to load the front of the car with ballast.

3. The class
Eg. There is no performance  angle winder formula one car that I am aware of 

4. Gears
The inline contrates with the smaller pinion often don't have the range of gears available at the top end. 
It's possible to get a 10 tooth pinion to work but the 11s are always ropey.

I prefer AW up to25K but beyond that  inline is my choice. (Of course BRSCA type race ers will totally disagree with this)

Hope this helps.
Alan
Ps if you think an NSR mosler sidewinder is best, it's likely that you are having traction problems which causes the bigger motors to spin up the wheels instead of putting the power down.