Collin's comment is correct for LAN type interfaces and not correct for point to point interfaces. If the outbound interface is a point to point interface I do not see any disadvantage to specifying the static route with outbound interface and I have seen a few situations where it was a benefit to do so.
In a LAN interface it is generally best to specify the next hop instead of specifying the outbound interface. Of course it is possible to combine both and configure a static route which specifies both the outbound interface and the next hop. By doing this you control the next hop and the interface used to get to the next hop.
It is the media. P2P (HDLC, PPP) does not have an ARP mechanism and does not need one since there can be one and only one device connected there is no need to resolve the layer 2 address to use in the packet (resolving the layer 2 address to use in the packet is the purpose of ARP).
So if no ARP then there is no adverse aspect in configuring a static route specifying the outbound interface when the interface is P2P.
Formerly in the WAN case it was recommended to use the egress interface, in order for the route to be removed from the routing table when the interface goes down, and this is not what happen if using next-hop ip. Removing the route from the routing table if interface goes down is very useful when using floating static routes, my understanding is that this is not a constrain since IOS 12.3, can anyone comment on me.
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