In my mind the pecking order is… right at the bottom you have your Voltronic Infini (the 3k and 4k models). Man those were rubbish. Then you have the Axpert, which I consider the best house in a bad neighbourhood, if I can borrow a real estate analogy. Yes, I consider the Axpert a better option than the budget Infinis… even though it cannot grid-tie.
Next up is the sunsynk, then the Goodwe, then Big Blue. Yes, I think Goodwe makes a better machine than Sunsynk. Just based off what I’ve heard and seen of them.
I can think of at least three other brands which are even more expensive (and rightly so), as we continue this pecking order, but I will leave it here 