There are 4 entry modes,
CrossoversingleLevel is new in version 53.39.
It is slightly improved over Crossover in results.
If you build say 50,000 systems, you likely will find that the top 250 systems use one specific entry type.
The exception is Crossover and CrossOverSingleLevel which are extremely close in operation.
For S&P500 with CloseD secondary filter, CrossOverSingleLevel was the best. (Slightly better than CrossOver)