Any with any and the results can vary.

I am connected to a Huawei cabinet, one of my ECI modems gives significantly better speeds than my two HG612s and they both slightly different in performance.

I choose to have the HG612 connected so I can access the line stats easily but could change if I wish.

In reply to a post by MHC:

I am connected to a Huawei cabinet, one of my ECI modems gives significantly better speeds than my two HG612s and they both slightly different in performance.

Of course you can't access the line stats from the ECI modems so you can't compare them with the line stats from the Huawei.

May not be able to access stats and I did not say I could, I specifically said speeds and with the three common testers,, here, BT and speedtest.net I can see a significant improvemen.

But you don't know if there's interleaving, fast path or G.INP. And crucially you don't know if there are errors.