My old a/c compressor died which is 3 phase. Should I install a new 3 phase a/c? What SEER?

Is there a benefit to reinstalling a 3 phase 5 ton compressor? Are three phase a/c compressors more energy efficient? Are they more expensive? What is the appropriate SEER? Our KW cost is about 13 cents and we live in South Texas where it is warm year round. Should we also install a new inside air handler?