Planting Arborvitaes

I am going to plant some Arborvitae, behind my house, as a noise barrier to an interstate. Can anyone tell be the difference between "Steeplechase Arborvitae" and "Green Giant Arborvitae"?

USAFVet,
Steeplechases Arborvitae grows to 20 ft. Checkout the links for information on both.

http://www.monrovia.com/plant-catalog/plants/874/steeplechase-arborvitae/

Green Giant Arborvitae:

http://www.waysidegardens.com/product.aspx?p=33468&utm_source=msn&utm_medium=cpc&utm_campaign=IDS_Trees&utm_content=IDS_Trees_Trees_33468&utm_term=Green%20Giant%
20Arborvitae&CAPCID=3998275147&CA_6C15C=120019360000065743

It looks like the Steeplechase has denser foliage. I guess if you're looking at drowning out road noise, that'd be a better bet.

Don't recognise any of the terms used for the different tree's / shrubs, my only advice would be to use evergreen, or you may have the privacy or noise barrier lost IF the tree's / shrubs become bare.
Also choose something you would like to look at, I know a lot of gardeners here who have selected fast growing stuff and 5 years later, they have a good shelter belt from the winds we get here BUT, they HATE the look of there now maturing specimen the shape, leaf,
the multi main growing tips / stems, and sorely regret going for the cheapest or the fastest growing. do as much research as you can to buy the type of plants you need and would like to spend many years looking at them, fastest and cheapest is not always the best in the end.
Best Regards. WeeNel.

I agree about Green Giant.... because it also has a fast/low care aspect.... as in it will grow very quickly and that is a plus, but it is also drought resistant, so you won't have to spend all summer watering it to keep it alive.

http://www.garden.org/plantguide/?q=show&id=3351

Just be very careful not to go crazy wanting fast closing on your area, because when they grow into each other's space too much they will kill each other. So, if you don't place them far enough apart, they are going to start falling down in about 10 or 12 years... I have seen a yard like that, tons of evergreens, killing each other, it looks terrible and it is a hazard.

I constantly place plants too close together, it is terrible, I get stuck moving or killing things constantly. I haven't done it with trees though, those tend to be too much work to move later, so I always follow the directions on those.

If there is enough room to do a staggered or zig-zag row that will create a much denser sound barrier faster than a single line.

Annakari makes a very important point about not crowding the plants too close.
Yes, it will take a little longer to get the best coverage, but then that sound barrier will last a LOT longer.

I also have seen a row of the wrong species planted too close.
Wrong for this zone, wrong for the location and watering, and now the line is 3/4 or more dead.