It depends on your team, but generally LO Gengar is much deadlier.
Now for my question..
Out of the following, who is generally best as a late game sweeper (assuming the team can support the Pokemon properly):
Calm Mind Suicune, Calm Mind Latios, or CurseLax?
Suicune has Scald, so oppenents can occasionally be forced to use special attacks, which barely scratch Suicune as it Calm Minds.
Latios has Speed, instant recovery and a great STAB.
Snorlax is the bulkiest, and after a curse he can effectively wall both physical and special attacks