I had a Samson SR850, which is a copy of one of the Superlux headphones. I just can't remember which...
Either way, it was good for the price, but it was not even close to being a can for monitoring (thick bass, recessed mids, and sharp upper mids and treble).
So, my hands-on experience with Samson/Superlux is very limited, but based on that, what I've read from others, and the very few measurements of Superlux cans that have popped up online, it would not be a go-to brand for me if I were considering something for monitoring. It could very well be that one of the products you mentioned are better than what I heard, but I really think you can do better than that.
Honestly, most of the headphones you've mentioned here aren't going to be great for production or monitoring...
And though there have been variations in the ATH-M50 (which I think stabilized a couple years ago), I wouldn't call them bass-oriented. They have a bit of additional bass and I think a small bump around 4KHz (fixable with EQ). Not a crazy smooth FR overall, but definitely more towards the neutral side with a slight U curve. Most of the headphones you've mentioned here are likely going to be much more problematic in some way (more trade-offs), less even/neutral when it comes to FR (which you need for production and monitoring), and not as good as all-rounder cans. My second choice would be a good K550 if you can find one.
If you have a store where you can demo headphones, try that. Otherwise, I get more use looking at measurements than subjective opinions (it's no help when opinions are all over the place for one product). Tyll has a large database on Innerfidelity, though you should read up on his methods, FR curve compensation, etc. Basically you won't see and don't necessarily want to see perfectly flat responses in his graphs. Purrin also does measurements, but I don't think I'm allowed to post links. His measurements have best correlated to what I hear with headphones. You can also find measurements on Golden Ears, though they're usually not as helpful for me. You can't directly compare across these sources, as they all use different measurement setups and techniques. But there is a lot of information to be gathered from them, and you will over time find ways to properly read the measurements and almost compare across sources to an extent. But you do need to combine this with subjective listening first, and you will eventually be able to map what you hear to what measurements show and better pick headphones from that. Measurements aren't the end-all-be-all, but they are an invaluable tool when combined with subjective impressions (from yourself and others).
Anyway, that's about all I have...