We've had many makes over the years and you soon get used to the noise. We've always found the compressor ones better. Going back a few years ago abac were, IMO, the best however a few bad experiences has led me to believe they are now built in a shed somewhere. We now have a delonghi which has so far been great.
As far as cost of running is concerned.....if you need it and you're getting damp problems I wouldn't really worry about the running costs!!
FFF