Wide angles include a lot more, and properly used, can make for some spectacular landscapes. However, it does include a lot more foreground and often, the foreground is only so-so. The secret to a good landscape shot, is interesting foreground, subject and then background, and that is a lot tougher to do than it sounds. The wider the angle, the harder it is to use one properly.
Fisheye's are very specialized, and even harder to use well. I find them better for party pics than nature/landscape.
Lensbabies are still an interchangeable format, you can get wide, fisheye and other lenses.