definitely migrate if you can, S is the new token and there will be delisting of FTM everywhere after majority already migrated.
PS as an after thought, your opinions regarding this project would also be appreciated.
this project is pretty good, the TPS is great, scalability is great, one concern that might be important for old FTM user is the dilution of S since they are trying to create a massive event that gonna distribute 200m $S in the future so expect the dilution.
though you can always stake your already migrated S token for a share of reward.