I have 4 or 5 helmets, ranging from cheap fixed shade ESAB's to my £1200 3M 9100FX helmet with 9100XX glass.
Going from one end of the spectrum to the other, I find I get best visibility on the fixed shade glass! in my opinion, they seem to do a better job at blocking the arc without blocking so much light you can't see what you're doing. If you can used to starting blind it's the way to go especially on a budget.
I bought a £120 3M 100v series, great helmet but as above, despite being good quality, and my go to helmet actually, you can see more with the fixed shade, but its comfortable and quality.
I have just bought a 3M 9100FX helmet with 9100XX glass (its a modular system, you can get various different UV filters depending on budget). The auto darkening filter on this helmet is very different to the cheaper £130 100V, for a start when you turn it on, the shade changes immediately, so it's obviously using power to become clearer, when tinted it is also more clear the 100V, allowing me to see more of what's going on around my weld, more like the fixed shade helmet – it doesn't seem brighter, but somehow I can see more?
And finally, I also have a cheap Chinese helmet (ive had 2 actually, the current one was from Cromwell, the other was eBay) I wouldn't recommend them at all, they clearly give me headaches and sore eyes, I suspect the time they take to switch isn't any where near as fast as they claim and you get a bit of a flash each time you start, and possibly the UV protection isn't what it should be – I'm sure they claim to meet all the required standards but who actually checks, and who could be held to account. The one from Cromwell doesn't have a brand on it, I know it's their own brand but they aren't taking responsibility.
I'd happily have another £120 3M 100V although I haven't tried ESAB's offering for that price range so I can't say which is better.