Not that I'm an expert on the subject, but I do know that Denise Rutkowski (with her background in 'exotic' dance before going into BBing) and especially the great Dianna Dennis were thought of as the best two posers (Dianna in particular) in the business. I always found Dianna's to be very artistic, Denise's, well, rather more raunchy and definitely a turn on.
Just my 2p's worth.