If you still want to live that WRT life with something like OpenWRT/LEDE (I think they re-merged now just under OpenWRT but I'm running LEDE currently) then I can highly recommend this [0] updated version. I have it and I can get gigabit speeds (wired) through it just fine and don't have any issues with the wireless other than at the far, far end of my house and only sometimes.
My next router will probably be a Ubiquity setup so I can setup 2-3 AP's for full coverage and coverage out to the (detached) garage but that setup is not cheap or simple and my current issues are so minor that it will be a while before I pull the trigger on that.
I bought a WRT3200ACM back in 2018. I wasn't able to get Tomato flashed onto it (Shibby or FreshTomato). I've flashed Tomato onto what feels like every other router under the sun (many dozens of models with a handful of different techniques tftp included). I wound up returning it and sticking with my RT-AC3200 instead.
Do you know if the situation has changed? Or do you still have to switch to OpenWRT or similar to use it?
My next router will probably be a Ubiquity setup so I can setup 2-3 AP's for full coverage and coverage out to the (detached) garage but that setup is not cheap or simple and my current issues are so minor that it will be a while before I pull the trigger on that.
[0] https://smile.amazon.com/gp/product/B01JOXW3YE/