Which option is better to create resilence sets on powerstore

I was read many doc about powerstore9200 . Actually my question is about Resience sets . In most docs it mentions it is better to create more resilence to have better reliability . So Does it means that is better create a a resilence set with 25 disks with one disk failure ? or create a reselience set with 50 disks and 2 disk failure ? Which one is better ? which one has more availability ?