Nice write up, but it ignores some of the greatest strengths of each unit.
As someone mentioned, paratroopers raise havoc behind enemy lines. Scout a city with an interceptor to make sure it's empty of militia or AT. Drop a paratrooper in. Build an airport, fly in more troopers and leap frog deep into unprotected enemy territory. Paratroopers are especially effective in establishing a beachhead on the other side of a river or isthmus. I take it as a given that dropping them behind the line means they're likely be killed before I can convert them or reinforce them, but they definitely have their place.
Commando make great infantry, but in my opinion, that's a piss poor use of their capability. They are far more effective as stealth units running wild behind enemy lines. I've taken the entire Eastern tip of the Kamchatka (over 8 counties) in 20 minutes by placing commandos in position ahead of time and stepping into the lands all at once. One minute it belongs to the other team, the next I have a beachhead in a mountainous area that would take days to travel, much less retake. I've taken a city, stepped out, let a huge searching army ride right by me and then stepped right back into the city. I especially like seeing a country that is going to fall, position my commandos in the country without taking anything as it's being conquered and then wait for the conqueror's army to roll past. They're a time bomb waiting to go off in a territory the conqueror is confident he's just cleared out.
If you have a good player that knows what they're doing, they'll eventually hunt them down and kill them, but not before you've ripped their infrastructure to shreds. I'll take 5 commandos loose in an enemy's back field over 10 stacked up into one army any day of the week.
