no, oasis is better, period. 6 drops in total, 4 of which are bronze. the only better alternative is base scramble II (40 charisma)

probably spica. but if you dont have silver archers ready for her, probably getting bashira to cc50. also, I think it's a good time to be switching to level these units to cc50 now, aside from maybe leveling a bandit. and while leveling, you can check out desert guide missions to see how you can work your way to 3* base scramble II