Today, there are many blackjack card counting systems. Here the list of the most popular ones in no particular order: Hi-Lo, KO, Omega II, Zen Count and Hi-Opt I along with Hi-Opt II. These six are all based on assigning negative, positive and zero values for the cards, but some are more complex than the others. The simpler ones include only the following values: -1, 0, and +1. Usually, with such systems the values of whole deck of cards will eventually get to the zero value. The more complicated count methods additionally have the -2 and +2 values, which sometimes can add up to quite big numbers, plus the deck of cards will not balance back to zero.
It is impossible to distinguish the best card counting system among all the variety of known approaches. The simple counting doesn’t require too much thinking, thus a player can place more bets in a given amount of time and potentially win more money. The multi-level counting is supposed to be more effective, however it is only under condition that a player can carry out several counts at a time without taking too much time. If you are a new to this that clearly you should start with simple systems, such as Hi-Lo or Hi-Opt I.