Play with both phones and see which you like best. Design and feel in the hand is important, as is the software. The LG wins by virtue of it's all day battery, better hardware, and bigger screen imho, the HTC has better speakers, but how often do you actually use the speakers on a phone?
Also consider if you'll put a case around it or not, usually a protective case negates some of the design as it basically renders smooth or shiny, plastic or metal out of the equation especially if it's a monstrous Otterbox.
There are also many reviews out on the web comparing the two, you have to decide which features are most important and go from there.