I think the type of primary that the open primary is the most effective at accomplishing the goal. This is because, while competitors may try appealing to the great party wing to obtain its selection, there is need of independent or sways voters who may appear more moderate and reflect a significant portion of the entire electorate. Holding an open primary would also get rid of intersect voting, by which those members of a particular party are registered with each other to influence its main election.
Having primaries often closed tend to lead to extreme candidates who appeal more to hardcore Democrats and hardcore Republicans rather than the average citizen. Open primary system allows individuals who don't identify with the views and goals of a particular political party a say in choosing that party's candidates. If one initially voted in the Democratic primary, only the Republicans have a hotly-contested run-off going on a few weeks later, you are not permitted to those times shift and vote in the Republican run-off, despite the fact that you aren't technically a registered member of either party.
The top two vote-getters for each office then contest against one another in the main election, regardless of party which can, theoretically, produce odd scenarios such as two Republicans facing off against each other for an office on the general election ballot with no Democrat and vice versa (Barrett, 10). In Louisiana, also feature a variation in which, if one candidate succeeds at garnering more than 50% of the vote on the initial primary ballot, no run-off is required and that individual wins the office outright.
Open primary system should be used since it is open to any registered voter wishing to participate in them. If you are a legally recognized voter living in an open primary state, one cannot register as a member of a known political party. I think that different types of primaries suit certain states. This is shown by the fact that nonpartisan blanket primaries are a rare, but interesting, type of primary, currently held in only three states: California, Louisiana, and Washington while the difficult to classify primary system is found in Texas. There is a difference between open primary that I prefer and closed primary. The distinguishing factor is that, in an open primary every person can vote for any contestant in either party irrespective of whether they are registered republican or democrat while in a closed system, one can only vote for those registered in the same party.
Barrett, Deborah. Cliffstestprep Foreign Service Officer Exam. Hoboken, NJ: Wiley, 2006. Internet resource.