Red Herring, while we await the body of evidence from Liam denigrating the cockpits/companioways of virtually all recent catamarans, perhaps I can make a few comments regarding your original question:
1. You will note that the Lagoon
has higher bridedeck clearance than the Leopard
which contributes to the transom design. This will no doubt prove more important to you than the number of steps; i.e., greater bridgedeck clearance means less slamming on boats with equivalent beam.
2. Important in avoiding swamping in a catamaran
in following seas (which is incredibly rare), is the amount of bouyancy aft of the cockpit. In that regard, the Leopard seems to be as good as the Lagoon due to the hull
extensions that create swim/boarding platforms.
3. Cats typically perform much better than monohulls in following seas, not only due to increaed bouyancy aft, but also due to their resistance to broaching. If a traditional monohull
is hit by a breaking wave off an aft quarter, the boat heels and the rudder
swings up, losing much of its bite. This causes the stern to swing off-course, away from the quartering wave. Very dangerous in large following seas!
A catamarman, with its greatly increaed beam aft, does not heel to any significant degree and its twin rudders continue to bite, keeping the boat on course. This is one of the reasons that Open 60's etc (trade wind
boats) are mimicking catamarans - increased beam with flat aft underbodies and twin rudders. Indeed, a number of recent production monohulls have followed this trend and again, indirectly complimented catamarans (imitation being the sincerest form of flaterry). Of course these monohulls, like catamarans, will tend to pound more than traditional monohulls when going upwind.