As others have said follow your SOP's.
Interestingly enough on the BBJ's some of the earlier BBJ1's (based on the -700 fuselage) have what they call a "soft" wing. On this model you slow the aeroplane to gear extension speed and carry out the emergency descent with the gear down. On the BBJ2's and later BBJ1's with the "hard" wing you descend without the need to slow to gear extension speed.