I've never been impressed with radioshack equipment. Adapters and bare wire from them are fine, though a little pricey at times.
Audio-Technica is decent, but I've only tended to use their equipment stands and cables.
If it is a choice just between the two, I'd do with Audio-Technica. However--I can't quite tell if they are designed for use with a battery pack transmitter, or if they can be plugged into a mixer. In any case, I wouldn't expect too much from either one.
I might go with a lav from Shure, but you won't be able to get something cheap. The lowest price for a lav mic is around $80 (a Shure WL93), and I'm not quite sure how that one behaves, as I have not used it.
I'd recommend trying to find an AV/recording forum to ask these questions on, rather than a web development forum to help you find the most appropriate equipment.