I own an Optrel Satellite.
I'm not familiar with the models you mentioned... so without researching them I couldn't advise on what's right for you. I agree though - that if your helmet only goes to 9 -- fugedaboudit. It needs to go to 5 or so because I do a lot of TIG at 7 and 8. And if you want to be able to weld two beer cans together you might be down at 6! LOL
"9" just isn't low enough. So that would be my "guide" on an autodarkening helmet. I personally love my Optrel - large view space - and I keep several clear covers in my welding inventory and change them whenever they get scratched up etc -- with this helmet it's super easy to do that.
Anyone trying to TIG weld with a one number shield (used for guys that arc welded pipes all day back before I was born.
) is going to find it IMPOSSIBLE.
Think of it this way --- The TIG machine was super expensive (relatively) so why would you try to use a cheap azz helmet. One GREAT helmet is able to do ALL your welding needs... so cough up and get one that makes it so you can at least see what the hell you're burning holes in.
