Two charts, side by side. Each person gets their four pillars, so you can see what is actually being compared rather than being handed a score.
The relationships that matter. Birth-year pair, whether the day stems form one of the five unions, the day-branch relationship, and whether either chart covers an element the other is short of.
A straight verdict. Strong fit, workable with one thing to watch, or needs attention — with the reason given, not just the label.
All you need is a date for each. The time makes it sharper — if you do not know it, tick the box and we read three pillars.