Enabling L3VPN multipath - BGP or routing-instance

Hi all,

In the context of L3VPN (family inet-vpn unicast), what's the difference between:

set protocols bgp group <group> multipath

and:

set routing-instances <vrf> routing-options multipath

If I have the same prefix announced from two PEs, enabling multipath at the BGP level works just fine. So what does multipath at the routing-instances level give me extra? When should I use one versus the other? Or should I enable both?

Thanks,

Bob