They both have pros and cons to them. The liquid filled units with heating elements take longer to heat up, but if the heating element dies after the warranty, they can be easily replaced. The units with wire cables heat up very quickly regardless of the size of the unit (about 15min), but if something happens and it dies outside of the warranty, these cannot be replaced. You would need to replace the entire towel warmer.Towel warmers that are liquid filled:Amba Jeeves & TraditionalArtos (Except Artos Triondo)Runtal (All models)Myson (All models with the exception of the Gem Collection)                                                                                    Tuzio