Hello,
I would like to buy a drone for recording myself when I am snowboarding, jumping big jumps, riding rails and boxes in the terrain park. I would like to know if this will be possible with Mavic or Spark. I read the specs that Mavic has only  14 km/h (9 mph) speed when using phone as remote but there is nothing about this in Spark specifications. I am sure that 14Km won't be enough to follow me when I will be jumping. Is there a way to use a phone and get a faster speed ? What about Spark will it be able to follow me faster than Mavic without a controller?
Another question, is there an option in the app to set the distance how far the drone should be from me and at which angle?

Thank you

Sorry I cant give you help with the specs but before going that far, What resort is allowing a drone as it sounds like you are riding a structured park. I know in the US they have all adopted the "No Drone" at mountain

in Canada, Grouse mountain, and backcountry

In Active Track, the max speed of the drone is mainly up to the speed in P-mode. If the tracking target is too fast, the drone might lose the object.  
For the other question you ask about, I think active track and the dynamic Homepooint may help. Please learn more info on the official web and the manual.
http://www.dji.com/mavic/info#video