ECC allows greater security for key exchange (because it is so cheap to generate keys we can have "ephemeral" exchanges and forward-secrecy). It isn't significantly better for signatures in most cases.

ECC is much faster (like 1000x) and with much smaller keys (like 10x) that are just random numbers so generating them is also free.

Yes, last night we all voted and decided to move to its successor RSB instead.