baz, it all depends on the venue and the method IMO, i think you will need to have both set up unless you only fish one venue! i have black and white hydro and 14 and 16 laccy! hydro stretches soooo far that in certain situations i would use laccy to control the fish and like malc i use preston laccy
For all my carping i use the Drennan power-glo in sizes 10 & upwards.
For the rest i use good old Preston Fluro.
Hydrolastic?????????? the jury's still out as far as i'm concerned,i've always found it a shade too stretchy.
But i've heard that it can be stiffened up by injecting some more fluid into it (with a syringe using slippery eel/son of a gun)so i may investigate that.