Ok to start this off I am personally far from a veteran space marine player especially since Ive only just got my list together and only have some units. But I am asking people who are experience to list their pro/cons on units in the SM army so that new players can view it. I well do the foot work of organizing it and making it easier to read. Above is a good example posted by Belthazor Aurellius that helped me develop my army list. This is just to help new players get an idea of what to do.Whirlwind:
Basically, a Rhino with some decent front armor. Able to lob medium strength ordnance up to four feet, and it doesn't have to see its target to hit it (though I've heard there's something with speeders, where they "spot" for the shot, and reduces scatter... don't remember if it's apocalypse only or not).
Pro: Long range, able to hide fully behind cover, to prevent sniping.
Con: Weak ordnance. Str5 doesn't do much to armor, even with a direct hit.
Once again, Rhino with good front armor. Can upgrade to have a siege shield, which prevents dangerous terrain from immobiling it. Lobs a high-powered cannon shell a short distance, and packs a whollop.
Pro: Can punch through any tank with one direct hit (or two at worst)
Con: 24" range means you have to get close. The siege shield comes in handy here, though, as you can wiggle through treacherous crap a predator or rhino can't, without risking their treads breaking.