Redundant WAN setup with router or switch?

[Krisbe]

Hi

I have two public networks. One public /29 for the transit between my network and the ISP and a public /24 for my servers.
What is the best WAN setup? The left one with a router or the right one with a layer 2 switch?

Because I don't do NAT, I don't need a VIP in my /29 network, right? If not, then I can't do the router-solution because I would need a /28 instead.

What's your opinion?