Putting two agencies side by side only works if you fill both columns from the same source. If you do not, you are comparing their sales stories, and the agency with the better storyteller wins.
Fill both columns from the same source
From the annual accounts (free, comparable, and filled in by nobody with an interest): EBITDA margin on gross margin, gross margin per full-time equivalent, the three-year trend, and equity. IKAg's factsheets calculate those four per agency, with the market median beside them, so you see at once which side of the threshold each one falls.
From their proposal, provided you asked exactly the same question: the scope in units of work, who executes it, and the price. Two proposals on different briefings are incomparable, however neat they look.
From the meeting: who works day to day, how long those people have been there, and what share their largest client represents.
What you can never line up
Two presentations. One had three weeks and a team of five, the other two weeks and a team of three; one got your question verbally and the other in writing. Presentation quality always gets measured whether you want it or not, and it weighs more heavily than anyone admits. The only antidote is a grid you fixed in advance.
The comparison that is worth nothing
The hourly rate. Two agencies at the same rate can differ eightfold in the amount of work on the same line. So compare price per unit of work, not price per hour. See what a normal hourly rate is.
A detail that makes the difference
Check whether they hang off the same group. Two candidates from one holding is not a fault, but it makes your comparison less independent than it looks. The factsheets show the group per agency, with an overview by group.
See also: which criteria to use and how to judge pitch presentations fairly.