Which one is more powerful?

I can see the C9 uses a 12V 3.3 Amp adapter while the A9 12V 2 Amp so I think the C9 is more poweerful am I correct in this thinking?

bradmoss wrote

Which one is more powerful?

I can see the C9 uses a 12V 3.3 Amp adapter while the A9 12V 2 Amp so I think the C9 is more poweerful am I correct in this thinking?

as I know, we cannot judge their performance via power consumption; compared to C9, archer A9 is a new product and it is a better choice if you wanna buy a wifi router.

you can't have an idea of the router based on power consumption but you can based on release date?

Everything newer is better that everything older?

I don't believe so.

bradmoss wrote

you can't have an idea of the router based on power consumption but you can based on release date?

Everything newer is better that everything older?

I don't believe so.

Umm, I did not make myself clear, What I mean new device is regarding to their similar specfications and functions. 

By comparing the spec page, the advanced features almost are the same, except A9 has 3 External Antennas + 1 Internal Antenna and supports TP-Link DDNS，DynDns, NO-IP.

So what I think is that cause it is a new device, the software used should be more secured and the performance will be better. 

Both have TPLINK DDNS, but I have found the power differences, it seems the C9 wins @2.4 GHz and the A9 wins @5 GHz:

https://fccid.io/TE7A9V6

Device operates within approved frequencies overlapping with the following cellular bands: LTE 255,Unlicensed NII-3 DOWN | LTE 46,TD Unlicensed DOWN |

Frequency Range	Power Output	Rule Parts	Grant Notes	App #
2.412-2.462 GHz	556 mW	15C	CC, MO	1.1
5.18-5.24 GHz	491 mW	15E	CC, MO	2.1
5.745-5.825 GHz	979 mW	15E	CC, MO	2.2

https://fccid.io/TE7C9V5

Device operates within approved frequencies overlapping with the following cellular bands: LTE 255,Unlicensed NII-3 DOWN | LTE 46,TD Unlicensed DOWN |

Frequency Range	Power Output	Rule Parts	Grant Notes	App #
2.412-2.462 GHz	708 mW	15C	CC, MO	2.1
5.18-5.24 GHz	421.7 mW	15E	38, CC, MO	1.1
5.745-5.825 GHz	901.6 mW	15E	38, CC, MO	1.2

per I read, C9 does not support TP-Link DDNS; https://www.tp-link.com/en/home-networking/wifi-router/archer-c9/#specifications

While cause they both have their pros, you may buy one of them based on actual request. 

Yes you're right, it does say the CP does not support TPLINK DDNS, but it was on the olver versions, the current version does support it.

Hardware-wise?

The C9 uses:

CPU1: Broadcom BCM4709A0 (1 GHz, 2 cores)
FLA1: 16 MiB (Winbond W25Q128FVSG)
RAM1: 256 MiB (Nanya NT5CC128M16IP-DI)

Source:  https://wikidevi.com/wiki/TP-LINK_Archer_C9_v5.x

The A9 uses:        

CPU1: Qualcomm QCN5502
FLA1: 128 MiB (Qualcomm QCN5502)
RAM1: 128 MiB (ESMT M14D1G1664A-2.5B)

Source: https://wikidevi.com/wiki/TP-LINK_Archer_A9_v6.x

Thank you.

Yes, the hardware version can affect the features supported by the router. 

Thanks for share these info, and I think you may have your final decision now, lol. 

Price for C9 and A9 are same. Which one should I buy? I need a longer range coverage and fast performance (over 100Mbps).