was talking powder actuated vs tapcons on another thread and thought there were some things worth mentioning on a specific thread.
Keep in mind when using blue concrete screws (Tapcons), they are only made to go about 1" into concrete. If you try to go deeper you get binding problems and they stop short and/or snap off during installation.
if you need to go deeper for a heavier duty application consider a product like a wedge or sleeve anchor. Many companies are also making a tapcon like product, that is much thicker and can be embedded deeper in concrete. These are sold under the names, Titan Screws, HDT, Wedge Bolts, and others. I have seen them as large as 3/4 in diameter and 8" long. Keep in mind that you will probably need an SDS hammer and impact gun to use these, but they are easy and STRONG, and well worth it for heavy duty concrete anchoring