If they are tank raised then neither are more likely to host. In fact they prolly won't although it does happen occasionally. The wild caught ones are the ones that host anemones more readily and their favorite kinds are carpet anemones but those are a little too big for your tank honestly. They will also host bubble tips sometimes. They are both about the same size and they have about the same temperment. They are the most docile of the clowns. The occelaris have a thin black line while the perculas have a thick one. They are really almost the same kind of fish TBH. They just happen to be a different breed. Kind of like two different breeds of dogs who act and look similar. The biggest ones I have ever seen were prolly 7 inches but that is enormous for those breeds of clowns. In your tank they will prolly stay around 4-5 inches at full grown.