Well, there are generally 3 more common ways to associate a power manifestation to DS/LS, depending on who you ask:
1) Some powers are DS/LS while some are neutral. Though there are oftentimes LS version of DS power and vice versa.
2) Intention of Your actions dictates DS/LS/neutral/etc.
3) LS(Jedi) calls upon the force going with its flow, DS(Sith) bends the force to the wielder's will.
I personally tend to believe in (2), and considers (3) as difference between Jedi and Sith and not LS/DS. (1) would be too over-simplified and would only be good for kiddies and the like.