I would choose the DSC-WX5 over the DSC-HX5 for these reasons:

• It's newer
• It's cheaper
• It has a faster aperture
• It has a better flash

However it is important to notice that the HX5 has a 'better' focal range, 25-250mm versus the WX5's 24-120mm. If you feel you need this added zoom, then the HX5 is definitely the one to get. They both have a digital zoom feature as well but it's best advised to not use this as it just zooms into the image that's already there (i.g It's like opening a photo on your computer and zooming in on it past its resolution). Another thing I noticed with the HX5 is that it has GPS which may be useful for geotagging your photos if you're into that.

When choosing a point and shoot camera I generally go for whatever is cheapest since the cameras contain similar sensors. But don't just listen to me. Look for features you'll actually use.

This is really all about what you're going to use the camera for and how you're going to use it.

P.S Don't worry too much about the cameras' megapixels (resolution) you'll be able to get very large photos from both of these.