Their leader bonuses won't effect each other so depends on who else you have on the team...
Anakin's leader ability applies to Lando at a reduced rate. At the omega level, Anakin's leader skill should give 15% offense and 10% crit damage to Lando. Lando should also get Advantage if he is evaded. At least, that's what the description says:
Jedi and Clone allies gain 30% Offense and 20% Critical Damage and other allies gain half that amount. Whenever an ally is Evaded, they gain Advantage for 2 turns.
Considering Lando doesn't REALLY (compared to the others) benefit from his leader skill and 2 of your remaining 3 toons would be either Clone or Jedi, go with Anakin, no doubt.
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Anakin's leader ability applies to Lando at a reduced rate. At the omega level, Anakin's leader skill should give 15% offense and 10% crit damage to Lando. Lando should also get Advantage if he is evaded. At least, that's what the description says: