Frameless shower doors need to be designed better than a framed door. They are more prone to leakage, due to the fact that they have less metal to keep the water in. Make sure that your tile person properly slopes your dam and walls back into the shower pan so the water will always stay in the shower.
Tub and shower enclosures usually use sliding doors to access the bathtub. There are new designs that accent your enclosure with different types of headers and tracks. There are many type of decorative glass, as well as 3/8” and ¼” thick clear glass. Towel bars and knobs finish off the doors functional design.