Without more information about your network, it will be difficult to give you a direct answer:
1) Do you need BOTH switches to do LAN/Internet routing?
2) When you say “failover”, are you talking about routing failover? or
3) Do you want one active and the other idle untill the primary fails? (Since you mentioned CORE, figured they’d both be up and running at the same time)
4) What services will you be running on your LAN (Data, Voice, etc..)
The more info you give us, the better we can assist you…