Olram has more going on, and thus is more likely to fool. However, each have their own advantages. In some scenario's, using Olram subtlety may make something seem fishy, whereas the flushtration count seems very fair, and is very convincing.
not really. The flushtration Count shows all cards to be the same while the olram shows the identity of at least two cards. The first one is mostly used to show a small packet of cards as having the same identity while the 2nd is mostly used t conceal cards and the cards that do show are meant to be remembered by the audience as not the same. E.g if you used olram you could show the red tens and two random cards as being a 4 of a kind.
The Olram Subtlety is a false count with cards developed by Ed Marlo (Olram is Marlo backwards) that show all cards are the same when in fact half are different.
First description in The New Tops, Vol. 5, N° 11, november 1965.
Used in the popular card effect Eight Card Brainwave.
The Flushtration Count, also known as the Back Count, is a card display that show all cards are the same when in fact they can be all different.
It was popularized by Brother John Hamman in his trick "Flushtration", marketed by Abott's in 1969.
The principle is of undiscovered origin as noted by Norm Houghton in Ibidem, No. 1, June 1955.