What level Frostwing is best to attack? Lv1 is the cheapest to attack and I get some nice rewards from it. Lv2 costs about 80% more energy to attack. The EXP increase is about the same. Aside from a small chance to get higher resources and gem rewards it also gives the same loot as that of Lv1 Frostwings. So I prefer attack Lv1 more to get more chances of getting loot, then attacking Lv2s less with a slightly better chance for bigger loot per run. Ive received 1 FW heart so far. And I dont remember it was from a Lv2 FW or a lv1 FW gift.
So my question is: Is it better to attack higher levels FWs or to stick with Lv1 FWs? And why?