I prefer the ones with a rather bulbous head. I'm by no means a "huge" guy, but I think I am bigger than the average and I like it loose over the head and not too tight on the shaft. If you go to condomexpress.com, you can choose various fits (loose, large, small, ultra thin, etc) from a drop down menu and take a look at what I'm talking about. I just ordered some Kimona E, among others, from them.
There is another site out there, condomania.com, that actually carries 70 different sizes. You measure you hard dick and then find your size on a chart . There was an article in Men's Health a couple years ago that said buying the proper size makes all the difference in the world and touted this site. I've not tried them myself, but may the next time I have to order condoms (I just ordered about 100 from condomexpress......six months supply .
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Recently tried the female condom with my wife and cann't say I was impressed.
Best of luck