Last 2 years I bought MBPr 13". After using it for 3 months I sold it (just want to try mac).

Recently I bought MBA 13 (8Gb with 256GB SSD), because I need a lightweight device. I don't feel comfortable resting my palm too long on MBPr due to their sharp edge on wrist.

Retina is good, but only for those applications that support it (yeah, tried retinizer too).

Well, it's up to your main preference and priority. Last time I ditched MBA13 due to lack of 8GB and PCIe based SSD.