both have there own flying charicteristic
drongo is a more
"yank and bank" type of plane cuz its elevon control and very limited on things you can do but she flys like almost any wing type plane fun
Polaris is a great "all weather and ground" type of plane that can do anything and everything
land n take off on grass, concrete,ice,snow,water,mud and a VERY stable flier.
many get mess up flying the polaris cuz the do the controls too high so it become VERY twitchy. so when setting up make sure to dail it down and add expo to have a nice flying polaris.
drongo is MUCH easier to buld whele the polaris has many more parts, example, it take me about 6 hour to make a polaris and it took me 2 hour to make the drongo
i say build both!!!!! you have fun!!! really
hope that helps rich