Well I'd say this isn't strictly an SEI vs. ESI issue. I'd personally use the talanov functions, ESI's have Qi while SEI's have De, with Qi being much more judging and disagreeable than De(which does stand for doormaet btw). Other types that have Qi (typically) are SEE, LII, and ILE, and for De there's ESE, LIE, and ILI.