Heroes 5.5 WarGame Edition - Tactical Edition.

Here's how I would prioritize what to look for when examining a unit.

First, auras or area-of-effect abilities,
then activated abilities,
next, immunities,
after that, class-specific/standard abilities,
and finally, static/effect/random abilities.

First, it's clear where to position units,
then, what abilities are used,
when casting, you can see which immunities apply,
class-specific abilities provide additional hints during casting/attack,
and finally, the unique features of a specific unit.