What do you need? Roserade and Lilligant are both powerful Sp. Attackers. While Roserade has more coverage and support options, Lilligant can use Quiver Dance and Petal Dance- combined with Own Tempo it never gets confused. Roserade can use Sludge Bomb, Venoshock, Dazzling Gleam etc. as well as set up Toxic Spikes / Spikes.
Cradily is a tank, basically. Storm Drain is a good ability, since it allows you to switch safely into Water-type attacks. Giga Drain, Recover and maybe Toxic are all part of Cradily's game plan.
Tsareena is the physical attacker. It lacks coverage (until USUM move tutors are implemented in Reborn), but I guess you could try something like Trop Kick, High Jump Kick, Play Rough (egg move) and a filler move, Synthesis maybe?
Basically the choice comes down to what your team needs.