I actually tend to really like Russian Caravan blends...although they're highly variable and hard to generalize about.
Most lapsang souchong on the market is too smoky for me...and yet is also very mild and smooth, in terms of the base tea. I like the Russian caravan blends because they tend to mute the smokiness a bit, while adding more kick, in terms of bitterness, caffeine, and general strength of the tea itself.
But it's hard to generalize. I've seen some Russian Caravan that is smokier than some lapsang souchong, and particularly among the better lapsang souchong, the smoke can be subtle. My parents used to drink Murchie's Russian Caravan a lot, and I recall liking that one a whole lot, but I haven't tried it recently.