Two Airport Extreme (6th gen): Two seperate networks or one router one bridge?

Greetings All,
I have fiber optic service and the modem that came from the ISP is wirelessly capable of old version of 802.11n and short range as well, it has four lan ports as well. So I bought two Airport Extreme (AE 802.11ac) and its working ok but I'm trying to understand the difference between the two scenarios in terms of efficiency and speed;
1. Fiber optic cable connected to modem. AE1 connected to modem Ethernet port 1
via physical Ethernet cable. AE2 connected to modem Ethernet port 2 via
powerline. DHCP disabled on AE 1 and AE2 and carried out by the modem. Wireless
on modem is of course disabled. SSID the same on both AE1and AE2 but 2.4 and 5
GHz channels are unique for each AE.
2. Fiber optic cable connected to modem. AE1 connected to modem Ethernet port 1 via
physical Ethernet cable. AE2 connected to AE1 Ethernet port 2 via powerline.
DHCP disabled on modem and AE 2 and carried out by AE1. Wireless on modem is of
course disabled. SSID the same on both AE1a nd AE2 but 2.4 and 5 GHz channels
are unique for each AE.
Any thoughts? Am I better off essentially creating two separate wireless networks or just one with one AE as a router and another as a bridge?

Your questions are really about a matter of preference. Both 1) and 2) are correct implementations.
In 1) above, the "modem" (which is actually a modem/router) is providing the routing services for the network.
In 2), the "modem" is acting as just that, a simple modem with AE1 acting as a router and AE2 acting as a "bridge" to AE1.
If you asked the support folks for your modem/router which setup was best, they would say 1).  However, if you asked the support folks at Apple which setup to use, they would say 2).
AE1 and AE2 are creating separate wireless networks, but if you use the same wireless network name,  or SSID,  and password for both networks, everything will act like one "big" network. Technically, this is called a "Roaming Network".

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