for a beginner to rc - electric. Electric (esp brushless motor) is consistent from day to day. You can expect a gas to need carb adjusting from day to day because of humidity and heat. Assuming you mean "nitro" when you say gas, the alcohol will absorb water from the air so there is another variation from fresh bottle/quart to end-of-quart. Some differences are evident even to beginners and are esp. evident to the pros. Electric is cleaner (no exhaust goop) so post run clean up only getting road/dirt off car. Get your feet wet with elect then graduate to gas.