I think we need a bit more info.
What turntable are you using? Some turntables have their stops set at a specific angle, while others can be set at any angle.
What is the distance from the center of the turntable to the end of your whisker tracks? While not a rule, setting the angle between tracks wider means you can bring the roundhouse closer to the turntable, narrower the roundhouse will be farther away.
I believe all roundhouses available are set at a specific angle. AtlasO's is set at 15 degrees. I believe Korber's are set for 12 degrees. Not sure about other makes.
If you don't have a lot of room, using AtlasO's with a turntable set at 15 degrees saves space (distance from turntable) but you get fewer tracks for the width you may have. Korber's needs more space but you get more tracks for the width.
I hope I said that right and it helps narrow your choices.