So, scanning this thread (and a few others) it seems that at present, the best bang for buck for a new device at present are those based on MT7621 (dual core MIPs 880MHz)?
I'm in the UK so the only device widely available without importing from China that uses MT7621 seems to be the Ubiquiti Edgerouter X. It was complex to flash until recently but I see the Wiki has been updated and it's possible to replace the system image using SCP/SSH?
The other target often mentioned is IPQ4018 (quad core 700MHz-ish depending on router model). In the UK this means Fritzbox 4040, Mikrotik HAP ac2 (both a bit complex to flash) or the Zyxel NBG6617 which seems to be flashable from the stock firmware.
Can anyone comment on:
A) Which is superior, 2c4t MT7621 880MHz or the 4c IPQ4018 638MHz (which is the clock speed on the Zyxel NBG6617)? For things like SQM and OpenVPN. I'm not sure how much difference the extra cores and threads make as opposed to the single thread performance?
B) The Edgerouter X is £50 but lacks wireless, and the Zyxel NBG6617 is £75 and has 2x2 AC1300 radios. Which is the better purchase?
My go to for years has been the Archer C7 V2 as it's rock solid on LEDE/OpenWRT. However, the V2s are becoming rare (for a while it was easy to pick them up for £30ish second hand). The Archer C7 is still sold new in the UK for around £70-80, usually V4s, which until OpenWRT 18.06 was on snapshot. However, paying £70-80 for a single core MIPs seems to be a waste of money nowadays given the options above.
I run a very small residential IT support business. In the UK most people are either on BT 10Mbps down/1Mbps up ADSL or 67Mbps down/18Mbps up FTTC VDSL, so an Archer C7 is more than enough, especially in smaller residences. Some people have multiple APs across a larger property, but still at these WAN speeds, so an Archer C7 can still handle this, although I sometimes use the BT Smart Hub 6 in these instances as it's a dual core 1GHz device and seems to hold up OK under load, especially compared to the Home Hub 5 (running stock firmware), which crashed frequently in the same setup.
Other than BT or providers that use BT's infrastructure (Openreach), there's only really Virgin Media which is fibre then coax, with maximum speeds of 300Mbps down and 30Mbps up. Soon-ish BT will roll out G.fast meaning speeds increase to 300Mbps down and 50Mbps up. There are a few small true FTTP residential operators (Hyperoptic for example), but they have very little coverage at the moment.
TL;DR is I'm looking for a rock solid replacement recommendation for a cheap OpenWRT router that is the "new" Archer C7 V2: cheap, widely available in the UK and rock solid for up to 300Mbps down/50Mbps up. For those on higher speeds I guess it's IPQ80xx/Marvell/x86 devices for OpenWRT or the beefier Ubiquiti/Mikrotik gear?