Beer is fermented grain; whether it's wheat or barley or rice or corn, (or sorghum or any of dozens of other grains used around the world and through history) the alcohol and calorie content depends on the recipe, not the grain used. For example, a German weizenbock like Schneider Aventinus is anything but light beer.

Personally, I like wheat beers best in hot weather. But that's a subjective decision and other people like other styles or enjoy wheat beers at other times. Drink what you enjoy. Find a good beer bar and feel free to experiment.

I am not a doctor, I am a journalist, but there are medical studies showing that moderate consumption of beer has health benefits. Like with many other things, it's overuse that makes it bad for you. So find a beer you enjoy the taste of, not a beer that you use as an alcohol delivery system, and just have one or two.