[NLRS] Which is the most "rare" of EN44, EN45, EN54, and EN55?

[David Palm]

We'll be roving to the grid convergence of EN44,  EN45, EN54, and EN55 this
weekend, operating from there Saturday afternoon and into the night.  If we
were to see a nice 6 meter opening and nobody in WI/MN is paying attention
to us until it shuts down, which grid would be the best one to park in to
work the 6 meter opening?  Which one would most hams want to have?

Thanks and 73,

David  W9HQ