In Part 1, I didn't really go in depth on the various choices to be made for defense. I simply talked about what I did and how I set up the board. Here I'm going to go over the various choices for Heavy Support and Troops, as those are what you'll be taking.
Support Platform: If you put a D-Cannon in a bastion, I guarantee you will get a 24" clearance around them. Every time I've taken them in regular games, my foes always give them a wide berth. Of course, they try to kill them as fast as possible, and they always do, but inside a Bastion they should be safer. If you take a Vibro-Cannon, you'll have to place them carefully. Don't take the other option. I don't even remember what it's called.
War Walker: In my opinion, not the best for defense. These guys are great for flank harassment and supporting fire, but if you take them for Planetstrike, they're probably best held in reserve to harry the flanks later.
Wraithlord: A great choice. Plop one of these guys in a Bastion and he's not going anywhere. It won't need to test for Wraithsight as long as the Bastion is intact, but once it plops make sure you've got a seer nearby. I give these guys Bright Lances and Wraithswords in case they get assaulted.
Dark Reapers: If you're playing against Marines, there is really no better choice. An Exarch with a Tempest Launcher and Crack Shot will do most of the killing for you all game. Place them in a protected, center bastion with a good line of sight.
Falcon: Great for bringing reinforcements onto the field, but it's not a very killy unit. A couple of them might be good for a hammer/anvil type defense.
Fire Prism: Same as the Falcon, but a little more killy and no transport option.
Wraithguard: A full unit of 10 makes for a great defense troops choice. They're tough and their guns can put fear into elite armies. Their short range and low rate of fire will cause horde armies to laugh at them, however.
Dire Avengers: A solid choice as usual. Hunkered down in a bastion they can provide great close-range defense with a well-timed Bladestorm. Keep a Farseer nearby so they can benefit from Doom.
Rangers/Pathfinders: These guys are better left out of a Bastion, finding cover on the board somewhere. Behind a defense line they should get a 2+ cover save. They aren't the most killy, but can take out a few things here and there. They'll mostly act as a speedbump.
Guardians: Ummm....put them in a Bastion? A full unit with psychic support could be a good close-range defense, and the support weapon can help bring some firepower to the table.
Jetbikes: I don't really see a point to these guys in Planetstrike. In the case of contesting, Attacker always wins so there's no turn 5 Turboboosting to claim objectives. They're not killy enough to be a good defender unit. I can see them being used as flank/rear armor distractions, but that's about it.
I'm going to play the Attacker on Tuesday, so I'll have a report on that later.