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I personally like the redtail much butter then the rainbow. To me the rainbows have more of a brown body with a faded red color tail. The redtails have more of a black body with an orange tail.
I agree with homer the redtails are more of a jet black color, which i think looks better. Also, make sure it is compatible with your other fish and you meet its requirements.
I love my rainbow shark. He had so much personality. The red-orange of his fins are what attracts me to him the most. He loves hiding in this castle in my tank. Soon he will be to big to fit anymore!