They both have there uses. Only thing I would truly say that even compares the 2 is that they are mystic. Ss. Is a champ that you really need to learn his cycles, trigger s3 at just the right time and hope the opp has been throwing s1 so you don't push them to s3. Both can nullify things others cant. What I believe longshot can do that ss can't is great power gain due to karmas. Instant bleeds. Insane s2 with fate seal. But both can also be really limited. Ss against a bleed immune or LS against incinerate immune. I have LS as a r5 sig 55 4* and I use him more than my r4 5* ss.