If you are just hiring for the odd hour then wet is easier, however if joining a group or hiring from an FBO for an extended period then dry is better.
You will, of course, have to negotiate with the hirer between his wet ad dry rates to work out which is better i.e.dry would be best if £50 dry/£100 wet, wet is better if £80 dry/£100 wet.
Our group operates on a dry basis with you returning the aircraft filled to tabs.
J.