When I first learned to ride clipless I got the multidrectional cleats, but I made a point of training myself to only release outwards. Then I got the unidirectional cleats. It wasn't hard to adapt.
ONe advantage of the single direction cleats is you never have to think about which way to move your foot, and you don't have to worry where your pedal is. With the multidirection cleats, you might accidentally try to release inward when the chain stay or seat tube was blocking your heel, causing a delay in release.