I personally like UG, only because it's the newer trend and not as readily available. However, if you haven't done HC and have an urge to have the best of both worlds, why not! Go for it... you can always make changes after if you don't like the results.
Here's a tank shot I saved in my folder of "inspirations"... there's a combo of HC and UG executed well IMO.
On a side note... anyone know how this like river/stream was achieved underwater like that? Looks like some type of resin or something.