Coated strings will last longer than non coated strings. Thats the idea behind them, keeps out the dirt, or something to that effect.
Previously I used Elixir's Coated strings pretty religiously and they are not the same as EMP's. Their coating is slippery on the fingers making the strings silky and smooth, but still have great tone. Warwick got pretty unnoticeable coating with the EMP's, they are just as rough as the non coated Black Label strings which is hard to get used to after being on Elixir's so long.
Elixir's for me are a few bucks cheaper than EMP's but they are more common and easier to come by, as far as tone battle between the 2 I definitely prefer the EMP growl a little more. The Elixir's were brighter sounding to me, but sometimes the harmonics (unintended) overpowered the natural tone, the EMP's mellow that out big time and you get great Warwick Growl.