good day guys, i am new into this hobby, and i am ready to purchase one bird for me, but my problem is i am looking between two models (Walkera 83 and GH-83 by Amax), the funny part and confusing was when i asked the suppliers to send me a manual/product specs i found out that they are identical to the smallest things. walkera 83 said to be using nitro with 15a engine(i still dont know what a 15a is) and sales people from Amax says GH-83 uses regular gasoline(it also says it uses 15a engine). So please to the experts out there, anyone of you can me a hint on these two models please......... thanks in advance.