Hands down. I admit for one that I'm speed biased, but get this: Lurantis' special movepool is pitifully small
And that one sentence is enough to settle this. Seriously, a mixed sweeper with access to no other special moves except Solar Beam, Hidden Power, Hyper Beam and Energy Ball. Not all worth it at all. Tsareena outclasses Lurantis with a broader movepool.
However: If you do get access to egg moves, i.e. Leaf Storm, with the ability Contrary (which is a hidden ability, to complicate things), you might want to consider it a Mixed Sweeper. This is not feasible in game and to be honest, it's outclassed by the likes of Contrary Serperior, so again, Tsareena as a dedicated Physical sweeper wins over Lurantis.