If you dont have itchy fingers, i advise the 19 turn. i find its good to practise in a somewhat faster motor. After that the stock racing will seem much easier...
I definitly dont think is a good ideia to use a 13 turn motor for 2 reasons: a) its probably too wild if u are just starting and b) u dont have a good ESC. Low turns motors are harder on ure batteries and eat is a major concern. Im not sure why (maybe the frequency, not sure) but lower spec ESC seem to eat the engines even more. If u already blew a 15 turn that means that probably ure esc is not nice to hot engines. Theres no reason to believe tha same wont happen with a even hotter engine.
Low turn motors draw more amps and are suposed to be more powerfull. Singles are suposed to have more torque and triples and quads more rpm's and top speed. However other things are important (brushes compound, brushes, layout, springs, cans, gearing, timing) and they all play major roles on how a engines behaves.