
GL.iNet
GL-MT6000 (Flint 2)
OpenWrt enthusiast's choice; good value, but lacks 6GHz.
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I use a TP-Link Deco X50-5G ax3000 whole home mesh WiFi 6 router from Lazada, coupled with an AIS 5G SIM. Ties in nicely with the rest of my Deco mesh.
I tested swisscom sim card and wingo swisscom 1st sim, and even their 2nd sim option with 5g internet upgrade and that was quicker than my copper via Sunrise at home. Now I get 500mbps over wifi on a bad day, and up to 800 on a good. Compared to AX6000 router with cable it's always 500 or less. Price difference 15 vs 50. Device is: TP-Link Deco X50-5G
Get a 4G/5G capable router. Buy your own data plan take it wherever you go. TP-link have some decent 4g/5g routers with wifi 6 standard. Or you could go with a gl.inet travel router
I got those cheapo deco x50 with wired backhaul, there are better ones. But the biggest difference I made was everything that doesn't move gets a cable. *everything*
My opinion. Asus aimesh. I have tried TP Link X50 but they spend more time offline than on. Orbi is superb however its too rigid. One router and 2 satellites doesnt like bridge mode or AP Mode. I moved to Asus with RT-BE92U as router and XD4 mini access points. Router mode, AP mode both work well. Versatility of being able to use most of their routers interchangeably as access points. There are downsides. Asus mesh doesnt seem to like IoT devices for smart home. Speakers, bulbs etc. Haven't tried Ubiquiti which a lot of people absolutely praise. If it was within my budget I would try it. Comes down to budget. If you can afford it. Ubiquiti by all accounts. Asus is a great option, Orbi is good if you use it as they want you to. TP Link for me is budget friendly but I think you would end up replacing it and spending again.
The brand isn't specifically the issue here, it's that you choose the base entry models such as the x10 & x20... You need to choose the appropriate models that will cater for the capacity and coverage your going to need. Deco is a basic home user mesh system that supports guest and iot networks, although I only ever use the x50 and above models... Ubiquiti once again is a brand and if you choose the wrong models, then your going to be blindly saying Ubiquiti is rubbish... Make sure you use a controller with Ubiquiti vs stand alone access points, individually configured.
Well I'd be considering simply upgrading your Deco system with atleast one x50 if not two... Deco x50 2 pack is roughly $300 It's going to be cheaper than going down the Ubiquiti route, considering your going to need a UX7 at roughly $400 + a U7-IW and stand at roughly another $400 to replicate your current setup.

GL.iNet
GL-MT6000 (Flint 2)
OpenWrt enthusiast's choice; good value, but lacks 6GHz.

Ubiquiti
Dream Router 7
Advanced management, but limited Wi-Fi 7 range, SFP+ issues.

Ubiquiti
Dream Machine Series
Comprehensive control, stable for large homes, but slow support.

Ubiquiti
UniFi Dream Router (UDR)
Modular, user-friendly, but tricky advanced setup, poor penetration.

GL.iNet
Beryl AX (GL-MT3000)
Travel king, versatile, OpenWrt, but bulky power adapter.