Heavy vehicles are actually tougher in my opinion because so many people are going infantry/plasma heavy and leaving the melta at home. No melta means your Land Raiders don't give a rat's arse about 90% of enemy shooting. Takes a lot of Lascannons to take one down.
Really depends on your local metagame. In a recent tournament I played 8 games with my drop pod marines, and I faced 2 CSM foot lists, a SW foot list, SM bike/Tau list with no vehicles, Eldar foot list (lol), Tau with 2 heavy vehicles, 2 transports and 2 markerlight vehicles, GK/IG with 2 Dreadknights and some Rhinos with allied Manticore, and an SM list with 2 Contemptor Mortis dreads (ouch). So not much by way of vehicles at all, 4 armies had 0 AV models, 1 had only monstrous creatures (Eldar), 1 with only 1 medium tank and 2 MC, 1 with 2 Walkers and 1 with real vehicles (that I podded down next to and melta'd). My long range anti tank was very inefficient with almost nothing to shoot at. Most opponents could not have responded to a Land Raider at all. Without mobility a Leman Russ may as well be a Land Raider almost, if you're shooting at the front.
Sounds like a fun game Phil.